Patent Publication Number: US-11036422-B2

Title: Prioritization and source-nonspecific based virtual machine recovery apparatuses, methods and systems

Description:
PRIORITY CLAIM 
     Applicant hereby claims benefit to priority under 35 USC § 120 as a continuation-in-part of: U.S. patent application Ser. No. 16/424,469, filed May 28, 2019, entitled “Multiclient Backup Replication Apparatuses, Methods and Systems”; and which in turn: claims benefit to priority under 35 USC § 120 as a continuation-in-part of: U.S. patent application Ser. No. 16/391,243, filed Apr. 22, 2019, entitled “Source Volume Backup with Predictive and Lookahead Optimizations Apparatuses, Methods and Systems”; and which in turn: claims benefit to priority under 35 USC § 120 as a continuation-in-part of: U.S. patent application Ser. No. 16/391,205, filed Apr. 22, 2019, entitled “Source Volume Backup with Adaptive Finalization Apparatuses, Methods and Systems”; U.S. patent application Ser. No. 16/055,347, filed Aug. 6, 2018, entitled “SYSTEMS AND METHODS FOR COPYING AN OPERATING SOURCE VOLUME”, and which in turn claims benefit to priority under 35 USC § 119 as a non-provisional conversion of U.S. provisional patent application Ser. No. 62/541,952, filed Aug. 7, 2017, entitled “SYSTEMS AND METHODS FOR COPYING AN OPERATING SOURCE VOLUME”. 
     Applications of interest include: U.S. patent application Ser. No. 16/285,189, filed Feb. 25, 2019, entitled “Object-Level Metadata-Preserving Cross Heterogeneous Operating Systems Backup And Restore Apparatuses, Methods And Systems”. 
     The entire contents of the aforementioned applications are herein expressly incorporated by reference. 
    
    
     This application for letters patent disclosure document describes inventive aspects that include various novel innovations (hereinafter “disclosure”) and contains material that is subject to copyright, mask work, and/or other intellectual property protection. The respective owners of such intellectual property have no objection to the facsimile reproduction of the disclosure by anyone as it appears in published Patent Office file/records, but otherwise reserve all rights. 
     FIELD 
     The present innovations generally address backup systems, and more particularly, include Prioritization and Source-Nonspecific Based Virtual Machine Recovery Apparatuses, Methods and Systems. 
     However, in order to develop a reader&#39;s understanding of the innovations, disclosures have been compiled into a single description to illustrate and clarify how aspects of these innovations operate independently, interoperate as between individual innovations, and/or cooperate collectively. The application goes on to further describe the interrelations and synergies as between the various innovations; all of which is to further compliance with 35 U.S.C. § 112. 
     BACKGROUND 
     Computer system backups are utilized to protect data from being lost due to equipment failures, malware and accidental deletions. A backup may involve copying files to be backed up from one location to another location. For example, files may be copied from a solid-state drive in a user&#39;s desktop to an external hard drive that may be connected to the user&#39;s desktop via USB. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Appendices and/or drawings illustrating various, non-limiting, example, innovative aspects of the Prioritization and Source-Nonspecific Based Virtual Machine Recovery Apparatuses, Methods and Systems (hereinafter “MBR”) disclosure, include: 
         FIGS. 1A-B  show block diagrams illustrating example aspects of backup networks, according to some embodiments for the MBR; 
         FIG. 2  shows a block diagram illustrating an exemplary embodiment of a backup system, according to some embodiments for the MBR; 
         FIG. 3  shows a logic flow illustrating embodiments of a backup processing (BP) component for the MBR; 
         FIGS. 4A-B  show an exemplary process for copying a particular source volume to a target volume, according to some embodiments for the MBR; 
         FIG. 5  shows a datagraph illustrating data flow(s) for the MBR; 
         FIG. 6  shows a logic flow illustrating embodiments of a finalization settings determining (FSD) component for the MBR; 
         FIG. 7  shows a logic flow illustrating embodiments of a predictive optimization settings determining (POSD) component for the MBR; 
         FIGS. 8A-B  show implementation cases for the MBR; 
         FIG. 9  shows a logic flow illustrating embodiments of a lookahead optimization settings determining (LOSD) component for the MBR; 
         FIGS. 10A-C  show implementation cases for the MBR; 
         FIGS. 11A-B  show a datagraph illustrating data flow(s) for the MBR; 
         FIG. 12  shows a logic flow illustrating embodiments of a service pairing (SP) component for the MBR; 
         FIG. 13  shows a logic flow illustrating embodiments of a service backup processing (SBP) component for the MBR; 
         FIG. 14  shows a logic flow illustrating embodiments of a source replication (SR) component for the MBR; 
         FIG. 15  shows a logic flow illustrating embodiments of a target replication (TR) component for the MBR; 
         FIG. 16  shows implementation case(s) for the MBR; 
         FIG. 17  shows implementation case(s) for the MBR; 
         FIG. 18  shows a datagraph illustrating data flow(s) for the MBR; 
         FIG. 19  shows a logic flow illustrating embodiments of a prioritized backup processing (PBP) component for the MBR; 
         FIG. 20  shows a datagraph illustrating data flow(s) for the MBR; 
         FIG. 21  shows a logic flow illustrating embodiments of a prioritized restore processing (PRP) component for the MBR; 
         FIG. 22  shows a datagraph illustrating data flow(s) for the MBR; 
         FIG. 23  shows a logic flow illustrating embodiments of a source-nonspecific backup processing (SNBP) component for the MBR; 
         FIG. 24  shows a datagraph illustrating data flow(s) for the MBR; 
         FIG. 25  shows a logic flow illustrating embodiments of a source-nonspecific restore processing (SNRP) component for the MBR; 
         FIG. 26  shows implementation case(s) for the MBR; 
         FIG. 27  shows implementation case(s) for the MBR; 
         FIG. 28  shows implementation case(s) for the MBR; 
         FIG. 29  shows a datagraph illustrating data flow(s) for the MBR; 
         FIG. 30  shows a logic flow illustrating embodiments of a virtual machine restore processing (VMRP) component for the MBR; 
         FIG. 31  shows a logic flow illustrating embodiments of a virtual machine restore processing (VMRP) component for the MBR; 
         FIG. 32  shows a block diagram illustrating embodiments of a MBR controller. 
     
    
    
     Generally, the leading number of each citation number within the drawings indicates the figure in which that citation number is introduced and/or detailed. As such, a detailed discussion of citation number  101  would be found and/or introduced in  FIG. 1 . Citation number  201  is introduced in  FIG. 2 , etc. Any citations and/or reference numbers are not necessarily sequences but rather just example orders that may be rearranged and other orders are contemplated. Citation number suffixes may indicate that an earlier introduced item has been re-referenced in the context of a later figure and may indicate the same item, evolved/modified version of the earlier introduced item, etc., e.g., server  199  of  FIG. 1  may be a similar server  299  of  FIG. 2  in the same and/or new context. 
     DETAILED DESCRIPTION 
     The Prioritization and Source-Nonspecific Based Virtual Machine Recovery Apparatuses, Methods and Systems (hereinafter “MBR”) transforms backup configuration request, restore request inputs, via MBR components (e.g., PBP, PRP, SNBP, SNRP, VMRP, etc. components), into backup configuration response, restore response outputs. The MBR components, in various embodiments, implement advantageous features as set forth below. 
     INTRODUCTION 
     The MBR implements a way to backup data in an iterative way that reduces the size of the Copy-On-Write (CoW) file. A finalization method may be utilized to determine when to stop the iteration and enter CoW mode. Optimization methods (e.g., predictive optimization, lookahead optimization) may be utilized to improve efficiency by providing iteration and redundancy reduction. The MBR provides unconventional features (e.g., a finalization method that has advantages in terms of reduced COW file size, establishing a snapshot closer to the target point in time, reduction in resources (cpu, transmission), avoiding an extended or perpetual process when data is changing rapidly) that were never before available in backup systems. 
     Logical volumes can be written to by one or more operating systems. These logical volumes can also be copied for multiple purposes, such as for backup of critical data or applications, or to make the contents of the source logical volume available at another time or location. 
     One way to create a copy of a source logical volume that is crash-consistent is to suspend all writes to the source volume while the copying process is ongoing. This can be achieved by instructing an operating system managing the source logical volume to stop writing to the source volume while the source volume is being copied to a target volume. However, for large logical volumes, this can impose an undesirable burden on performance since the time required to copy the source volume may be lengthy. For instance, the copying procedure may take hours, during which the source volume may be unable to accept new write requests. 
     Another way to create a copy of a source logical volume that is crash consistent is to cause the operating system managing the source volume to enter a copy-on-write mode before the copying process starts, and to remain in the copy-on-write mode until the source volume is completely copied to the target volume. A source volume can be considered to comprise multiple “blocks” of storage, wherein each block stores a certain amount of data. When in copy-on-write mode, the operating system intercepts every write instruction to the source volume before the write occurs. The operating system then determines, for every write, whether the write would (if allowed to proceed) modify a block of the source volume that has not yet been copied to the target volume. If the to-be-modified block has already been copied to the target volume, the operating system can allow the write to proceed. If the to-be-modified block has not yet been copied, the operating system can copy the original, un-modified contents of the to-be-modified block to a “copy-on-write file” or “CoW file”, thereby preserving the original state of the to-be-modified block. After the original contents of the to-be-modified block have been safely copied to the CoW file, the operating system can allow the write instruction to modify the block. 
     At a later time, when the process copying the source volume to the target volume attempts to copy the modified block, the copying process can be re-directed to copy from the portion of the CoW file that stores the original contents of the modified block. In this way, the copy of the source volume that is copied to the target volume remains crash consistent because it reflects the state of the source volume at the instant the operating system entered copy-on-write mode (i.e., at the beginning of the copy process). A copy of a source logical volume that is crash consistent is typically associated with a time designation, where the time designation refers to a time that the copy process commenced, at which time the copy is crash consistent. 
     However, causing the operating system to enter a copy-on-write mode can also impact the performance and responsiveness of the operating system and the source volume. Requiring the operating system to examine every write instruction to the source volume, and potentially copy blocks of the source volume to the CoW file, can tie up scarce computational resources needed for other operating system processes. Furthermore, copy-on-write mode can decrease the perceived speed with which the source volume responds to write instructions. If the copying process takes a long time, and if the operating system makes many writes to the source volume during the copying process, a large amount of storage may need to be reserved for the CoW file to store the large number of blocks that are modified. In some systems, this storage for the CoW file must be reserved in advance, even though the operating system cannot predict exactly how long the copying process will take, or how many writes will need to be made to the source volume during the copying process. If the storage reserved for the CoW file is too small to hold all the blocks that were modified during the copying process, the entire copying process may fail. In these cases, the copying process may need to be re-started from the beginning. If the storage reserved for the CoW file is too large, less memory storage space is available for other data and/or applications. 
     These problems are exacerbated when copying large amounts of data to remote sites via network connections, such as Internet communication to the cloud. Communication over the Internet can be a relatively slow process compared to processes such as computation, file edits, and local copying. Such communication lengthens the copying process leading to more time for growth of the CoW file and presents problems with data transmission interruptions. Accordingly, systems and methods for copying data and data volumes are needed to address the shortcomings of current approaches. 
     According to one aspect, the present disclosure is directed at systems and methods for copying an operating source volume. For example, these systems and methods may be used to take a “snapshot” of an operating source volume, wherein the snapshot preserves a crash-consistent state of the source volume. According to some embodiments, a crash-consistent state of the source volume can reflect a state of the source volume as it existed at a single point in time. A crash-consistent state can also refer to a state of data on a volume such that if a computer managing the volume were to lose power or crash and be rebooted, the data on the volume can be operated on by the computer&#39;s operating system without error or data corruption. In some embodiments, if data in a crash-consistent state is restored to a computer, the operating system should be able to operate on the data as if the operating system had been powered off and on again. 
     According to one aspect, the present disclosure is directed at a method for copying a source volume comprising multiple blocks to a target volume while an operating system is configured to write to the source volume. The method can comprise (a) designating a set of one or more blocks to be copied from the source volume to the target volume; (b) copying the designated set of one or more blocks from the source volume to the target volume while the operating system is configured to write to the source volume; (c) identifying blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during step (b); (d) if one or more blocks were identified in step (c), comparing an aggregate size of the identified one or more blocks to a threshold, wherein: (d) (i) if the aggregate size is greater than or equal to the threshold: changing the designated set of one or more blocks to be copied from the source volume to the target volume to include the identified one or more blocks, and repeating steps (b), (c), and (d); (d)(ii) if the aggregate size is below the threshold: causing the operating system to enter a copy-on-write mode, in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block, and bringing the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered. 
     In some embodiments, the method includes changing the designated set of one or more blocks to be copied from the source volume to the target volume in (d) (i) to include only the identified one or more blocks. 
     In some embodiments, the method can conclude if no blocks were identified in step (c). 
     In some embodiments, designating the set of one or more blocks to be copied from the source volume to the target volume in step (a) comprises designating at least one of (i) all allocated blocks in the source volume, and (ii) all blocks in the source volume. 
     In some embodiments, the operating system can refrain from entering the copy-on-write mode during steps (a), (b), (c), and (d)(i). 
     In some embodiments, the method can further comprise receiving, during step (b), an indication that the operating system has written to a block of the source volume; determining, during step (b), whether the written-to block has already been copied to the target volume; if the written-to block has already been copied to the target volume, adding an identifier corresponding to the written-to block to a list of modified blocks; and if the written-to block has not already been copied to the target volume, refraining from adding the identifier corresponding to the written-to block to the list of modified blocks, wherein step (c) comprises evaluating said list of modified blocks. In some embodiments, the evaluating said list of modified blocks includes identifying blocks that are to be copied. According to some embodiments, the blocks that are to be copied are from important files. These files may be identified based on a desired configuration. Important files may include but are not limited to files such as documents or system settings. Files that are not to be copied may include less important files, such as temp files, blocks that have been deleted, browser histories, or other files that a system operator may deem unimportant based on a desired configuration. 
     In some embodiments, the method can further comprise receiving, during step (b), an instruction from the operating system to write to a block of the source volume; and adding an identifier corresponding to the written-to block to a list of modified blocks, wherein step (c) comprises evaluating said list of modified blocks. 
     In some embodiments, the threshold can be determined based on a maximum number of blocks that may be transferred from the source volume to the target volume within a target maximum time. 
     In some embodiments, the threshold can be determined based on a pre-defined proportion of a total size of at least one of the source volume and the target volume. 
     In some embodiments, the aggregate size of the identified one or more blocks can be a numerical count of the identified one or more blocks, and the threshold comprises a number of blocks. 
     In some embodiments, step (d)(ii) can comprise copying the identified one or more blocks from the source volume to the target volume while the operating system is in the copy-on-write mode. 
     In some embodiments, the source volume can be a client device and the target volume can be a backup aggregator at a site local to the client device. 
     In some embodiments, the source volume can be a client device and the target volume can be a storage server at a cloud storage center remote from the client device. 
     In some embodiments the source volume can be an aggregator and the target volume can be a cloud storage center remote from the client device. 
     In some embodiments the source volume and target device are volumes contained within the same device, such as a client computer or other computing device. 
     In another aspect, the present disclosure is directed at a computer system for copying a source volume comprising multiple blocks to a target volume while an operating system is configured to write to the source volume. The system can comprise: the source volume; a communication interface communicably coupled to the target volume; and at least one processor configured to execute computer-readable instructions which, when executed, cause the at least one processor to: (a) designate a set of one or more blocks to be copied from the source volume to the target volume; (b) copy the designated set of one or more blocks from the source volume to the target volume while the operating system is configured to write to the source volume; (c) identify blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during step (b); (d) if one or more blocks were identified in step (c), comparing an aggregate size of the identified one or more blocks to a threshold, wherein: (d) (i) if the aggregate size is greater than or equal to the threshold: change the designated set of one or more blocks to be copied from the source volume to the target volume to include the identified one or more blocks, and repeating steps (b), (c), and (d); (d)(ii) if the aggregate size is below the threshold: cause the operating system to enter a copy-on-write mode, in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block, and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered. 
     In some embodiments, the changed designated set of one or more blocks to be copied from the source volume to the target volume in (d) (i) includes only the identified one or more blocks. 
     In some embodiments, the at least one processor can be configured to designate the set of one or more blocks to be copied from the source volume to the target volume in step (a) by being configured to designate at least one of (i) all allocated blocks in the source volume, and (ii) all blocks in the source volume. 
     In some embodiments, the at least one processor can be configured to refrain from entering copy-on-write mode during steps (a), (b), (c), and (d)(i). 
     In some embodiments, the at least one processor can be further configured to: receive, when executing step (b), an indication that the operating system has written to a block of the source volume; determine, when executing step (b), whether the written-to block has already been copied to the target volume; if the written-to block has already been copied to the target volume, add an identifier corresponding to the written-to block to a list of modified blocks; and if the written-to block has not already been copied to the target volume, refraining from adding the identifier corresponding to the written-to block to the list of modified blocks, wherein step (c) comprises evaluating said list of modified blocks. 
     In some embodiments, the at least one processor can be further configured to: receive, when executing step (b), an instruction from the operating system to write to a block of the source volume; and add an identifier corresponding to the written-to block to a list of modified blocks, wherein step (c) comprises evaluating said list of modified blocks. 
     In some embodiments, the threshold used by the at least one processor can be determined based on a maximum number of blocks that may be transferred from the source volume to the target volume within a target maximum time. 
     In some embodiments, the threshold used by the at least one processor can be determined based on a pre-defined proportion of a total size of at least one of the source volume and the target volume. 
     In some embodiments, the aggregate size of the identified one or more blocks used by the at least one processor can be a numerical count of the identified one or more blocks, and the threshold can comprise a number of blocks. 
     In some embodiments, the at least one processor can be configured to execute step (d) (ii) by being configured to copy the identified one or more blocks from the source volume to the target volume while the operating system is in the copy-on-write mode. 
     In some embodiments, the source volume of the computer system can be a client device and the target volume can be a backup aggregator at a site local to the client device. 
     In some embodiments, the source volume of the computer system can be a client device and the target volume can be a storage server at a cloud storage center remote from the client device. 
     In another aspect, the present disclosure is directed at a method for copying a source volume comprising multiple blocks to a target volume, the method comprising: (a) designating a set of one or more blocks to be copied from the source volume to the target volume; (b) copying the designated set of one or more blocks from the source volume to the target volume while an operating system is configured to write to the source volume; (c) identifying blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during step (b); and (d) comparing an aggregate size of the identified one or more blocks to a threshold, wherein: (d) (i) if the aggregate size is greater than or equal to the threshold: changing the designated set of one or more blocks to be copied from the source volume to the target volume to include the identified one or more blocks, and repeating steps (b), (c), and (d). 
     In some embodiments, the method includes changing the designated set of one or more blocks to be copied from the source volume to the target volume in step (d) (i) to include only the identified one or more blocks. 
     In some embodiments, step (d) can further comprise: (d) (ii) if the aggregate size is below the threshold: causing the operating system to enter a copy-on-write mode, in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block, and bringing the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered. 
     In another aspect, the present disclosure is directed at a computer system for copying a source volume comprising multiple blocks to a target volume, the system comprising: the source volume; a communication interface communicably coupled to the target volume; and at least one processor configured to execute computer-readable instructions which, when executed, cause the at least one processor to: (a) designate a set of one or more blocks to be copied from the source volume to the target volume; (b) copy the designated set of one or more blocks from the source volume to the target volume while an operating system is configured to write to the source volume; (c) identify blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during step (b); and (d) comparing an aggregate size of the identified one or more blocks to a threshold, wherein: (d) (i) if the aggregate size is greater than or equal to the threshold: change the designated set of one or more blocks to be copied from the source volume to the target volume to include the identified one or more blocks, and repeating steps (b), (c), and (d). 
     In some embodiments, the at least one processor can be configured to execute step (d) by further being further configured to: (d) (ii) if the aggregate size is below the threshold: cause the operating system to enter a copy-on-write mode, in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block, and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered. 
     In some embodiments, the MBR provides unconventional features (e.g., using a multiplexed data stream for efficient and timely replication of backed up Software as a Service (SaaS) data and/or other data from multiple clients on a cloud node to another cloud node) that were never before available in backup systems. 
     Clients may have data in the cloud (e.g., Google Drive) and/or other data (e.g., on a local client device) that they wish to back up in the MBR backup cloud. Once such data is backed up, the MBR may snapshot the data to create a restore point (e.g., creating a ZFS snapshot) to be used in a data recovery scenario. Subsequent incremental backups may take additional snapshots, creating more restore points. In one embodiment, the MBR facilitates backing up the snapshot data that is on a source node in the MBR backup cloud by replicating the snapshots to replication targets at a target node to create a secure second copy. In one implementation, the MBR removes the need to perform filesystem operations to calculate differences in client snapshot data between the source node and the target node by tracking and maintaining a queue of client snapshot data that should be replicated, as it is created on the source node. In another implementation, the MBR maintains a single TCP/IP connection and simultaneously transfers multiple clients&#39; snapshot data over the single connection by multiplexing the data into a single stream, better utilizing system resources. 
     In some embodiments, the MBR provides unconventional features (e.g., reduced Recovery Time Objective (RTO) and increased operation speed using recovery prioritized indexing of data blocks and/or source-nonspecific data blocks) that were never before available in backup systems. For example, unlike conventional systems, the MBR may utilize discrepancy hashes, checksums, or other compact representations of data blocks to determine whether to fetch data blocks from a source-nonspecific location or from a backup device during a recovery event. 
     In some embodiments, the MBR may yield reduced RTO and increased operation speed over current methods through use of recovery prioritized indexing of data blocks. Data blocks may be backed up onto backup storage and include a recovery prioritized index for fetching in a recovery event. A high priority is given to operating system data blocks, and possibly data blocks associated with certain critical applications. Additionally, recovery priority is given to blocks proportionally based on their last time of use or frequency of use. Higher priority is given to data blocks with short times since last access or high frequency of access. Lower priority is given to data blocks with long times since last access or low frequency of access. In a recovery event, the data blocks are fetched according to the priority indicated by their recovery index. The operating system can boot up after its data blocks have been fetched, or after blocks of critical applications and/or high access data have been fetched. The system can operate as the remaining data blocks are fetched. If a needed block is not yet fetched, it will be fetched on an as needed basis. This allows a system to operate as if it was restored without actually being fully restored. In some implementations, the MBR gains efficiency over conventional data recovery systems by exploiting data temporal locality. Temporal locality refers to the reuse of specific data, and/or resources, within a relatively small time period. Locality is a type of predictable behavior that enables system performance optimization. The premise is that data blocks that have been most recently accessed and/or more frequently accessed will tend to be needed sooner than blocks that have not been accessed recently or are not accessed often. 
     In some embodiments, the MBR may yield reduced RTO and increased operation speed over current methods through use of source-nonspecific data blocks. Data blocks may be backed up onto backup storage and include source-specific discrepancy hashes for fetching in a recovery event. In a recovery event, data blocks are fetched from source-nonspecific locations that provide lower transmission time penalties compared to fetching from the backup device. Source-specific discrepancy hashes and source-nonspecific discrepancy hashes of data blocks may be compared to determine whether there are differences. If there are differences between some source-nonspecific data blocks and the corresponding source-specific data blocks, such data blocks may be fetched from the backup device. 
     MBR 
     According to one aspect, the disclosed systems and methods address the performance problems discussed above. In particular, in some embodiments, the disclosed systems and methods may allow a crash-consistent state of a source volume to be copied to a target volume even as an operating system is actively writing to the source volume. The disclosed systems and methods may also accomplish this while decreasing the amount of time the operating system spends in copy-on-write mode. Decreasing the amount of time spent in copy-on-write mode can, in turn, improve the performance of the operating system by making it more responsive to user commands. Furthermore, decreasing the amount of time spent in copy-on-write mode can reduce the amount of storage that must be reserved for a CoW file, thus freeing up additional storage resources for other data or applications. Decreasing the amount of storage required for a CoW file can also reduce the likelihood that a copy procedure fails because an insufficient amount of storage space was reserved for the CoW file at the beginning of the copy procedure. In some embodiments, the CoW file can be part of the source volume being copied. However, the CoW file does not have to be part of the source volume being copied, but can be a file stored outside of the source volume. The CoW file can also be stored on a separate part of a physical storage device (e.g., hard-drive) that holds all or part of the logical volume, or on an entirely separate physical storage device. 
     In some embodiments the CoW mode is not entered at the commencement of the copying process and is instead entered at a time later than the time that the copy process has commenced. Accordingly, crash consistent copy may be created with an associated time designation at a time the CoW mode is entered rather than at the commencement of the copying. 
       FIGS. 1A-B  show block diagrams illustrating example aspects of backup networks, according to some embodiments for the MBR.  FIG. 1A  shows a block diagram illustrating example aspects of a backup network  100  that utilizes the disclosed systems and methods. In one embodiment, the backup network  100  may provide an image-based backup solution wherein a local device, e.g., a backup aggregator  102   a , is responsible for and facilitates the aggregation of image-based backups from a plurality of client devices local to and/or in communication with the backup aggregator. For example, in one embodiment, a given client site, e.g.,  101   a , may have one or more backup aggregators in communication on a local area network, e.g., backup aggregator  102   a . According to some embodiments, the devices may be in the same geographic site, campus. According to some embodiments, the client devices and backup aggregator are remote, for example, outside the local area network, geographic site, or campus. Client devices, which may be servers, workstations, laptops, and/or the like, e.g.,  103   a ,  104   a , may be in communication with backup aggregator  102   a  and periodically transfer (depicted as  105   a ,  106   a ) a representation of a block-level storage device to backup aggregator  102   a . The backup aggregator may thereafter generate a snapshot of the received image backup file(s) according to a local backup schedule. The snapshot operation may be client device specific, such as for example a local backup snapshot policy that generates hourly backups for a mission-critical mail server while only generating daily snapshots of image backup files from a user&#39;s laptop. The backup network may also be configured such that the transfer of image-based backup files from client devices (such as servers, workstations, laptops, etc., described above) may differ from the local snapshot policy itself. 
     In one embodiment, backup aggregator  102   a  may maintain such a local backup policy while additionally maintaining a remote backup policy. The remote backup policy may be a backup policy maintained at the backup aggregator that determines how frequently the backup aggregator will synchronize certain image-based backup file snapshot data with remote cloud storage center  109 . In one embodiment, backup aggregator  102   a  may coordinate the execution of its remote backup schedule (depicted as  107   a ) with a master server  110 . The master server may receive from the backup aggregator an indicator of the backup aggregator&#39;s last known storage server pairing within the cloud storage center  109 . A storage server, for example StorageServer A  111   a , may be a server that is directly paired with the backup aggregator such that it is capable of receiving and applying to its own snapshot capable file system a received send file representing the file system differences between image-based file backups snap shotted at two different points in time. 
     In one embodiment, after coordinating with master server  110 , a backup aggregator  102   a  may thereafter initiate a send file transfer operation (depicted as  108   a ), with its paired storage server  111   a  within the cloud storage center. In some embodiments, storage server  111   a  may itself have a paired or file system mirroring relationship with a second storage server. Such a backup network configuration may be useful in cases where the image-based backup snapshot history maintained on the backup aggregator would be advantageously stored on both the backup aggregator&#39;s paired server, e.g.,  111   a , and a secondary storage server located in a different geographical location. Such a configuration may enable recovery of cloud storage center stored image snapshot data even in scenarios where cloud storage center  109  is partially destroyed. 
     Furthermore, in one embodiment, the master server may direct the activity of multiple backup aggregators as well as manage or direct the pairing of backup aggregators with different storage server nodes within cloud storage center  109 , e.g., StorageServer B, C, D, E, or F (StorageServer F  111   b ). It should be understood that the maintenance of the local or remote backup policy need not necessarily be performed by a backup aggregator device. For example, the master server or a storage server could instead maintain a backup policy associated with the backup aggregator. In such a configuration, the coordination of the backup aggregator with the master server may, for example, additionally comprise sending or receiving information about the currently active local or remote backup policy associated with the backup aggregator. 
     In some embodiments, each client device (e.g.,  103   a ,  104   a ,  103   b ,  104   b ) can comprise a backup agent installed thereon to perform a backup or copying procedure. When the client device runs its backup agent, the backup agent may generate and send periodic backup files to a Backup Aggregator (e.g., Backup Aggregator X  102   a ). A periodic backup file may comprise an image-based backup. An image-based backup is a block-by-block copy of a portion of a hard-drive or logical volume. According to some embodiments, the image-based backup is of the allocated portion of a partially allocated hard-drive or logical volume or a portion thereof. According to some embodiments, the image-based backup is of portions of a hard-drive or logical volume that are selected by a user or system operator. According to other embodiments, the image-based backup may be of a full hard-drive or logical volume. A block refers to a specific physical area on a hard-drive, or a specific subset of a logical volume, which may contain data. In some embodiments, a block (sometimes called a physical record) can comprise a sequence of bytes or bits, having a specific length called the block size. Therefore, an image-based backup represents the contents of a source hard-drive or logical volume, exactly as this content was stored on the source hard-drive or logical volume at a single point in time. This data can include data associated with an operating system, and data stored in the system along with structural information and application configurations. The source used to create the image backup file need not actually be a physical hard drive and may, for example, be a virtual hard disk or even another image backup file. The embodiments described herein may be utilized on backup files that are based on a different formatting scheme but otherwise lend themselves to processing by the described embodiments of the backup network. Once generated, block-level image backup files may serve as the basis for restoring a hard drive or logical volume to a substantially similar state as present at the time of the backup, in particular, at the time of entering the CoW mode. Image backup files may contain additional data elements such as file system metadata that was present on the source hard drive or logical volume, master boot records, partition information and/or the like. This manner of backup may be distinguished from what may be thought of as a “file/directory level” backup which merely duplicates the contents and location of files and/or directories contained on a hard drive without necessarily including additional metadata, file system data, etc. 
       FIG. 1B  shows a block diagram illustrating another exemplary embodiment of a backup network  100 B that utilizes the disclosed systems and methods. In  FIG. 1B , the backup network  100 B may not include backup aggregators for some or all client sites (e.g.,  101   a ,  101   b ). Instead, client devices (e.g.,  103   a ,  104   a ,  103   b ,  104   b ) communicate directly with remote cloud storage center  109 . In these embodiments, a backup agent installed on a client device (e.g.,  103   a ) may communicate (e.g.,  107 C) with master server  110  in the cloud storage center  109  to coordinate the execution of its remote backup schedule. The master server may receive from the agent on the client device (e.g.,  103   a ) an indicator of the client device&#39;s last known storage server pairing within the cloud storage center  109 . For instance, the client device  103   a  may have been previously paired with StorageServer A  111   a . After coordinating with master server  110 , the backup agent on the client device  103   a  may thereafter initiate a send file transfer operation, e.g.,  108 C, with its paired storage server  111   a  within the cloud storage center. Similarly, the backup agent on client device  104   b  may coordinate (e.g.,  107 D) the execution of its remote backup schedule with master server  110 . If the client device  104   b  is paired with storage server  111   b , the client device  104   b  may initiate a send file transfer operation, e.g.,  108 D, with its paired storage server  111   b . The backup network  100 B of  FIG. 1B  differs mainly from the backup network  100  of  FIG. 1A  in that client devices may communicate and transfer image-based backup files directly with cloud storage center  109 , without the aid of a backup aggregator local to the client site  101   a ,  101   b.    
       FIG. 2  shows a block diagram illustrating an exemplary embodiment of a backup system, according to some embodiments for the MBR. In  FIG. 2 , the backup system  200  includes a source volume  203  and a target volume  211 . The source volume  203  and the target volume  211  may be on the same device (for example, on the same client computer or computer device, such as two partitions of a single hard drive or on two different hard drives on the same device) or may be on different devices (for example two different server blades or two different servers in the same location or at different locations connected via a communications network). 
     The disclosed systems and methods for copying a crash-consistent state of a source volume to a target volume may be used in several places in the backup network  100  or  100 B. For instance, the disclosed systems and methods may be used to copy data stored at a client device (e.g.,  103   a ,  104   a ,  103   b ,  104   b ) to a backup aggregator (e.g.,  102   a ,  102   b ) in backup network  100 . Alternatively, or in addition, the disclosed systems and methods may be used to copy data stored at a client device (e.g.,  103   a ,  104   a ,  103   b ,  104   b ) directly to a storage server (e.g.,  111   a ,  111   b ) in the cloud storage center  109  in backup network  100 B. The disclosed systems and methods may be particularly useful in the latter context because the time required to copy a source volume from a client device to a storage server in cloud storage center  109  may be longer than the time required to copy the same source volume to a backup aggregator local to the client device. If the time required to copy the source volume is longer, the disclosed systems and methods&#39; ability to decrease the amount of time the client device&#39;s operating system stays in copy-on-write mode becomes particularly important. As discussed above, decreasing the amount of time the client device&#39;s operating system stays in copy-on-write mode can be desirable because this lessens the performance burden on the client device, and decreases the amount of storage that must be reserved in advance for a CoW file. 
       FIG. 3  shows a logic flow illustrating embodiments of a backup processing (BP) component for the MBR.  FIG. 3  is a flowchart depicting an exemplary process  300  for copying a source volume to a target volume, according to some embodiments. As discussed above, the source volume may be managed by an operating system that continues to write to the source volume  302  during the copying process  300 . There is no need to take the source volume offline while the copying process is ongoing. Process  300  may be used to copy a source volume at a client device (e.g.,  103   a ,  104   a ,  103   b ,  104   b ) to a backup aggregator (e.g.,  102   a ,  102   b ) in backup network  100 . Alternatively, or in addition, process  300  may be used to copy a source volume at a client device (e.g.,  103   a ,  104   a ,  103   b ,  104   b ) to a storage server (e.g.,  111   a ,  111   b ) in cloud storage center  109 . 
     In some embodiments, process  300  may maintain at least three separate data structures: (i) a list of blocks to be copied from the source volume to the target volume (designated Blocks_to_Copy in the discussion below), (ii) a list of blocks that were modified by an operating system (OS) (designated Changed_Blocks in the discussion below), and (iii) a copy-on-write file (designated CoW_File in the discussion below). If used, the purpose and operation of each data structure is explained in greater detail below. When process  300  first begins, each data structure Blocks_to_Copy, Changed_Blocks, and CoW_File can be initialized to a null value. 
     At step  302 , process  300  designates blocks to be copied. In some embodiments, the designated blocks to copy can include all allocated blocks in the source volume. In embodiments that use the data structure Blocks_to_Copy, this can be done by updating Blocks_to_Copy to include a list that identifies all allocated blocks in the source volume. Allocated blocks in the source volume can include blocks that have been identified by a file system on the source volume as containing useful data—unallocated blocks can include blocks in the source volume that do not store useful data. In other embodiments, step  302  can also simply designate all blocks in source volume (whether allocated or not) to be copied—this can be done by updating Blocks_to_Copy to include all blocks in the source volume (again, whether allocated or not). In other embodiments, the designated blocks to be copied may not include all allocated blocks. A set of excluded blocks from particular files may not be copied. For instance, certain files may not be advantageous to a back-up and restore application. Examples of such files include, but are not limited to or required to include, page files, swap files, hibernation files, files within a temp directory, old versions of operating systems, files that have been deleted but are still recoverable. Other files may be excluded as well, depending on the back-up and restore application. Excluding blocks from these files in the copying process can reduce the time to copy and reduce the data storage requirement. In some embodiments, the designated blocks to copy may be adjusted based on predictive optimization settings. The designated blocks to copy may be adjusted so that initial passes copy primarily the data blocks that tend to be more stable, while later passes copy the data blocks that tend to change more rapidly. In one implementation, predictive optimization settings associated with a backup may be determined via a predictive optimization settings determining (POSD) component. See  FIG. 7  for additional details regarding the POSD component. For example, the predictive optimization settings may specify that busy blocks that tend to change more rapidly (e.g., determined based on historical change frequency) should not be copied during the first two passes (e.g., by adding the busy blocks to a Blocks_to_Copy_Later data structure). In another example, the predictive optimization settings may specify that blocks that changed most recently (e.g., such blocks may be more likely to change again soon compared to blocks that haven&#39;t changed in a while) should not be copied during the first five passes. 
     At step  302 , process  300  can cause the operating system to enter an incremental tracking mode. While in incremental tracking mode, the operating system can keep track of every write instruction that modifies a block of the source volume. In some embodiments, the incremental tracking mode can also keep track of the time at which each write instruction occurred, and/or the sequence in which the write instructions occurred. Unlike when the operating system is in copy-on-write mode, the incremental tracking mode does not attempt to copy to a CoW file the contents of blocks that are being written to. Instead, the incremental tracking mode keeps a running list of all blocks in the source volume that have been modified by write instructions since the tracker was turned on. Since the incremental tracking mode does not attempt to copy contents of blocks to a CoW file, the incremental tracking mode imposes a relatively small performance burden on the operating system managing the source volume. 
     At step  304 , process  300  copies the designated blocks from the source volume to the target volume. In embodiments that use the data structure Blocks_to_Copy, this step can comprise copying each block in the source volume identified in Blocks_to_Copy to the target volume according to a predetermined sequence, until there are no more blocks left to copy in Blocks_to_Copy. In embodiments that use the data structure Blocks_to_Copy_Later, this may comprise skipping copying blocks in Blocks_to_Copy_Later. In some embodiments, blocks are identified by a block number, and one example of a predetermined sequence is a numerically ascending order by block number. The predetermined sequence can also be based on physical locations of blocks on a memory device. For example, in some embodiments, each block may correspond to a physical location on a spinning optical or magnetic disk, wherein blocks are numbered according to the order of their physical locations on the disk. Physical storage devices that use spinning disks generally perform best when blocks are read sequentially in increasing numerical block order. Therefore, in some embodiments, the predetermined sequence may be arranged such that sequential or adjacent ranges of blocks are read in order from the block with the smallest block number to the block with the largest block number. Other types of physical storage devices may use solid state memory (e.g., SSDs) that uses different channels to read/write data in parallel. For these types of physical storage devices, the predetermined sequence may be arranged such that blocks are read in an order that pulls data from separate channels so they can be read in parallel (e.g., for improved efficiency) or such that blocks are read according to a randomly determined sequence. Other types of sequences for reading blocks are also possible. In some embodiments, the designated blocks to copy may be adjusted based on lookahead optimization settings. The designated blocks to copy may be adjusted (e.g., periodically, after a predetermined period of time) so that copying of changed blocks forward of the current copy position is accelerated and/or delayed to reduce the number of passes and/or to avoid redundant copying. In one implementation, lookahead optimization settings associated with a backup may be determined via a lookahead optimization settings determining (LOSD) component. See  FIG. 9  for additional details regarding the LOSD component. For example, the lookahead optimization settings may specify that accelerated copy optimization should be utilized to add data blocks that changed forward of the current copy position and that had not been marked as changed blocks at the start of a current pass to the designated blocks to copy. In another example, the lookahead optimization settings may specify that delayed copy optimization should be utilized to skip copying data blocks that changed forward of the current copy position and that had been marked as changed blocks at the start of a current pass. Depending on the size of the source volume  302  and the available bandwidth between the source volume and the target volume, step  304  may take a considerable amount of time to complete (e.g., multiple minutes, hours, or even days). After all designated blocks have been copied from the source volume to the target volume, process  300  proceeds to step  306 . 
     At step  306 , process  300  identifies at least one block in the source volume that was written to by an operating system after said block was copied to the target volume. This can be done by evaluating records, logs, or data generated and/or modified by the operating system while in incremental tracking mode. For example, during execution of step  304 , the incremental tracking mode could have determined whether each write by the operating system to the source volume is to a block of the source volume that has already been copied to the target volume, or has not been copied to the target volume. If the write is to a block of the source volume that has already been copied, the process  300  (while in incremental tracking mode) could add an identifier corresponding to the block of the source volume that was written to by the operating system to a running list of modified blocks. In some simpler embodiments, the incremental tracking mode could forego checking whether a written-to block has been copied to the target volume yet—instead, the mode could simply list all blocks that were written-to during execution of step  304 . At step  306 , the process of identifying blocks that were written to after said block was copied to the target volume may comprise evaluating the running list of modified blocks maintained by the process  300  while in incremental tracking mode. In embodiments that use the data structure Changed_Blocks, step  306  can comprise updating Changed_Blocks to include a list of each block that was changed after said each block was copied to the target volume. Said another way, Changed_Blocks can be updated to identify each block in the source volume whose corresponding copy in the target volume is now outdated. 
     In some cases, no blocks may be identified in step  306 . This may be because no blocks were written to by the operating system during step  304 . Or, alternatively, this may be because some blocks were written to by the operating system during step  304 , but all such blocks were modified before they were copied to the target volume (e.g., the target volume already includes the most up-to-date version of the modified blocks). In these cases, process  300  may end at step  306  without proceeding to step  308 . 
     At step  308 , process  300  determines whether to enter the CoW mode. In one embodiment, the CoW mode should be entered if finalization settings have been satisfied. In one implementation, finalization settings associated with a backup may be determined via a finalization settings determining (FSD) component. See  FIG. 6  for additional details regarding the FSD component. For example, the finalization settings may specify that the CoW mode should be entered if the block size metric has been satisfied (e.g., the aggregate size of all the blocks identified in step  306  is less than a threshold). The threshold may be a fixed aggregate size (e.g., expressed in units of storage such as megabytes, gigabytes, or terabytes), or may be a dynamic size calculated based on an available bandwidth between source volume and target volume, or the size of the source volume or target volume. For instance, the threshold may be calculated by determining the maximum amount of data that may be transferred from the source volume to the target volume within a pre-defined target maximum time, given the available bandwidth between the two computers hosting the two volumes, or it may be calculated based on a pre-defined proportion of the total size of at least one of the source volume or target volume. Alternatively, instead of comparing the aggregate size of the identified blocks against a size threshold, the number of identified blocks may be compared against a numerical threshold (e.g., 500 blocks). If the CoW mode should not be entered (e.g., the number and/or aggregate size of all the blocks identified in step  306  is greater than or equal to the threshold), process  300  branches to step  310 . If the CoW mode should be entered (e.g., the aggregate size is less than the threshold), process  300  branches to step  312 . 
     If process  300  branches to step  310 , the aggregate size of all the changed blocks that were identified in step  306  may still be relatively large. Process  300  may then change the designated blocks to be copied to be the blocks identified in step  306 . In embodiments that use the data structures Blocks_to_Copy and Changed_Blocks, this step can comprise updating Blocks_to_Copy so that it lists the same data blocks as the Changed_Blocks. In some embodiments, the designated blocks to copy may be adjusted based on the predictive optimization settings. For example, if the predictive optimization settings specify that the busy blocks should not be copied during the first two passes, the busy blocks may be removed from the Blocks_to_Copy_Later data structure and added to the Blocks_to_Copy data structure after the first two passes. Process  300  then branches back to step  304 . 
     When process  300  loops back to step  304 , process  300  once again copies the designated blocks from the source volume to the target volume, except this time the blocks that changed during the last copy procedure and/or the blocks that were designated to be copied later are copied. According to some embodiments, only the blocks that changed during the last copy procedure and/or the blocks that were designated to be copied later are copied. As discussed above, this can comprise copying each data block listed in Blocks_to_Copy to the target volume. In some embodiments, when process  300  loops back to step  304 , process  300  once again copies the designated blocks from the source volume to the target volume, except this time only the blocks that changed during the last copy procedure and/or the blocks that were designated to be copied later are copied. In copying only the blocks that changed during the last copy procedure (e.g., only the blocks that are identified by Changed_Blocks and Blocks_to_Copy) and/or the blocks that were designated to be copied later, other blocks that were previously copied to the target volume are not disturbed. Instead, those blocks in the target volume that are known to be outdated are updated to reflect these blocks&#39; new contents. In some embodiments, the designated blocks to copy may be adjusted based on lookahead optimization settings. 
     After completing step  304 , process  300  again branches to step  306 , where process  300  once again identifies blocks that were changed during the last copy procedure (e.g., the second time through step  304 ). In embodiments that use the data structure Changed_Blocks, this can comprise updating Changed_Blocks to include only those data blocks that changed during the last copy procedure (e.g., the second time through step  304 ). After completing step  306 , process  300  once again branches to step  308 . 
     If the rate at which data is being copied from the source volume to the target volume exceeds the rate at which data is being changed in the source volume by the operating system, the number and/or aggregate size of the blocks that are identified in step  306  should generally decrease each time process  300  loops through steps  304 ,  306 ,  308 , and  310 . With each loop, process  300  checks at step  308  whether the CoW mode should be entered (e.g., whether the aggregate size of the blocks identified in step  306  (e.g., the aggregate size of the blocks listed in Changed_Blocks) is less than the aforementioned threshold). If not, process  300  loops through steps  310 ,  304  and  306  again. If yes, process  300  exits the loop and branches to step  312 . 
     During steps  302 ,  304 ,  306 ,  308  and  310 , the operating system writing to the source volume does not operate in copy-on-write mode. However, at step  312 , process  300  enters copy-on-write mode. As discussed above, in copy-on-write mode, the operating system intercepts every write instruction to the source volume before the write occurs. The operating system determines, for every write, whether the write will modify a block of the source volume that has not yet been copied to the target volume. If the to-be-modified block has already been copied to the target volume, the operating system can allow the write to proceed. If the to-be-modified block has not yet been copied, the operating system can copy the original contents of the to-be-modified block to a “copy-on-write file” or CoW_File, thereby preserving the original contents of the block before it is modified by the write. The CoW_File is generally not part of the source volume being copied, but is a file stored outside of the source volume. As discussed above, the CoW_File can be stored on a separate part of a physical storage device (e.g., hard-drive) that holds all or part of the source volume, or on an entirely separate physical storage device. After the original contents of the to-be-modified block have been safely copied to the CoW_File, the operating system can allow the write instruction to modify the block. 
     At step  314 , process  300  copies the identified blocks (e.g., blocks identified the last time through step  306 , or the blocks listed in Changed_Blocks and/or the blocks that were designated to be copied later) to the target volume. As process  300  copies each identified block in turn, process  300  determines whether each identified block was modified by the operating system since the operating system entered copy-on-write mode. If not, process  300  copies the identified block from the source volume to the target volume. If yes, process  300  copies the original version of the identified block, as preserved in the CoW_File, to the target volume. A time associated with the time at which the operating system entered the copy-on-write mode can be used as a designation for the time at which the copy is crash consistent. For example, the time designation of the copy can be the hour, minute, second the CoW mode was entered, stated to a desired time resolution. According to some embodiments, some function of that entry time could be used for the designation. Such functions include but are not limited to the time of the last write event before the CoW process commenced, a fixed time before CoW commenced. 
     By the end of step  314 , the target volume contains a crash-consistent copy of the source volume. The copy in the target volume reflects the state of the source volume at the time when process  300  entered copy-on-write mode in step  312 , and not the state of the source volume at the time when process  300  began in step  302 . By delaying the time at which the operating system enters copy-on-write mode, process  300  improves the performance of the computer systems in backup networks  100 ,  100 B in several ways. First, process  300  decreases the amount of time that the operating system writing to the source volume (e.g., the operating system of client devices  103   a ,  104   a ,  103   b ,  104   b ) has to stay in copy-on-write mode. By decreasing the amount of time spent in copy-on-write mode, process  300  decreases the number of CoW-related writes to a CoW file that the operating system needs to perform, thereby decreasing the performance burden on the operating system. Second, by decreasing the amount of time spent in copy-on-write mode, process  300  decreases the amount of storage that must be reserved for a CoW file. This frees up processing and storage resources for other applications, thereby allowing client devices to perform faster and more efficiently. 
     At  316 , backup performance characteristics associated with the backup may be logged. In various implementations, logged backup performance characteristics may include the number of passes until CoW mode is entered, the amount of data stored in each pass, completion time for each pass, resource usage intensity (e.g., CPU usage, I/O usage, network usage, power usage), a usage profile associated with the backup (e.g., client device identifier, site identifier, customer identifier, date, time, day of the week, number of users), data blocks change frequency, and/or the like. For example, the backup performance characteristics may be logged via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 INSERT INTO PerformanceLogs (deviceID, 
               
               
                   
                 performanceCharacteristicsData) 
               
               
                   
                 VALUES (ID_client_device_1, “performance characteristics”); 
               
               
                   
                   
               
            
           
         
       
     
     Example C code for implementing process  300  is provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 // main logic of the copy process: 
               
               
                   ret = start_tracking(source_device, mount_point, &amp;cow); 
               
               
                   if (ret != 0) { 
               
               
                     return 1; 
               
               
                   } 
               
               
                   uint64_t how_much_copied = 0; 
               
               
                   while (1) { 
               
               
                     /* initial copy of all blocks (or all allocated blocks) */ 
               
               
                     ret = copy_identified_blocks (url, source_device, last_cow, 
               
               
                 &amp;how_much_copied); 
               
               
                 // no tracking file to work with, copy everything 
               
               
                     if (ret != 0) { 
               
               
                       return 1; 
               
               
                     } 
               
               
                     if (how_much_copied &gt; 500) // if the threshold has been 
               
               
                     surpassed, do it again 
               
               
                     { // atomically get the current tracking data, put it aside, 
               
               
                 and clear the tracking data list for the next sweep 
               
               
                       ret = reset_tracking(mount_point, &amp;cow); 
               
               
                       if (ret != 0) { 
               
               
                         return 1; 
               
               
                       } 
               
               
                       continue; 
               
               
                     } 
               
               
                     break; 
               
               
                   } 
               
               
                   /* so now we&#39;ve done a number of sweeps of live data to the point 
               
               
                 where our last sweep 
               
               
                    * did less than 500 blocks, now take a real snapshot and do one 
               
               
                    last copy. */ 
               
               
                   ret = make_snapshot(mount_point, &amp;cow); // transition to 
               
               
                   snapshot only 
               
               
                   if (ret != 0) { 
               
               
                     return 1; 
               
               
                   } 
               
               
                   // copy from source volume or from CoW file, as appropriate 
               
               
                   char snapname[1000]; 
               
               
                   sprintf(snapname, “/dev/datto%d”, MEGA_MINOR); 
               
               
                   ret = copy_identified_blocks(url, snapname, last_cow, 
               
               
                   &amp;how_much_copied); 
               
               
                   if (ret != 0) { 
               
               
                     return 1; 
               
               
                   } 
               
               
                 // end of main logic process. 
               
               
                   
               
            
           
         
       
     
     Example C code for copying identified blocks based on incremental tracking data is provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 int copy_identified_blocks(char *url, char *device, char *tracking, uint64_t 
               
               
                 *how_much_copied) 
               
               
                 { 
               
               
                   fdlive = open_direct(device, O_RDONLY); 
               
               
                   snap_size = lseek(fdlive, 0, SEEK_END); 
               
               
                   total_blocks = (snap_size + COW_BLOCK_SIZE − 1) / COW_BLOCK_SIZE; 
               
               
                   total_chunks = (total_blocks + INDEX_BUFFER_SIZE − 1) / INDEX_BUFFER_SIZE; 
               
               
                   lseek(fdlive, 0, SEEK_SET); 
               
               
                   mappings = (uint64_t *)mymalloc(INDEX_BUFFER_SIZE * sizeof(uint64_t)); 
               
               
                   for (i = 0; i &lt; total_chunks; i++) { 
               
               
                     blocks_to_read = MIN(INDEX_BUFFER_SIZE, total_blocks − blocks_done); 
               
               
                     if (tracking != NULL) { 
               
               
                       //read a chunk of incremental tracking data 
               
               
                       bytes = pread(fdcow, mappings, blocks_to_read * sizeof(uint64_t), 
               
               
                       COW_HEADER_SIZE + (INDEX_BUFFER_SIZE * sizeof(uint64_t) * i)); 
               
               
                       if (bytes != blocks_to_read * sizeof(uint64_t)) { 
               
               
                         goto error; 
               
               
                       } 
               
               
                     } 
               
               
                     //copy blocks where the incremental tracking says something was written 
               
               
                     for (j = 0; j &lt; blocks_to_read; j++) { 
               
               
                       if (tracking != NULL) { 
               
               
                         if (!mappings[j]) 
               
               
                            continue; 
               
               
                       } 
               
               
                       ret = copy_block(url, fdlive, (INDEX_BUFFER_SIZE * i) + j); 
               
               
                       if (ret) { 
               
               
                           goto error; 
               
               
                         } 
               
               
                       (*how_much_copied)++; 
               
               
                     } 
               
               
                     blocks_done += blocks_to_read; 
               
               
                   } 
               
               
                 } 
               
               
                   
               
            
           
         
       
     
       FIGS. 4A-B  show an exemplary process for copying a particular source volume to a target volume, according to some embodiments for the MBR.  FIG. 4A  depicts an exemplary process  400  for copying a source volume  402  to a target volume  403  that illustrates principles of process  300 . As discussed above, source volume  402  may be managed by an operating system (not shown) that continues to make writes to the source volume  402  during the entire copying process. Therefore, there is no need to take source volume offline while the copying process is ongoing. 
     At step  404 , process  400  begins when the operating system managing the source volume  402  enters an incremental tracking mode. As discussed above, the incremental tracking mode keeps track of which blocks have been modified by the operating system, and potentially the time and/or sequence in which these modifications took place. 
     At step  406 , process  400  begins copying every allocated block in the entire source volume  402  to the target volume  403 . This process may comprise a software loop that copies each block in the source volume  402  to the target volume  403  according to a predetermined sequence until there are no more blocks in the source volume  402  to be copied. For simplicity of explication,  FIG. 4A  and the subsequent explanation below assumes that the entire source volume  402  is being copied to the target volume  403  in step  406 . However, it should be understood that, in some embodiments, only the portion of the source volume that has been allocated by the operating system may be copied in this step; in other embodiments, the entire source volume (whether allocated or not) may be copied. Depending on the size of the source volume  402  and the available bandwidth between source volume  402  and target volume  403 , the process of copying the entire source volume  402  to the target volume  403  may take a considerable amount of time (e.g., multiple minutes, hours, or even days). 
     At step  408 , process  400  verifies that the process of copying the entire source volume  402  to the target volume  403  is complete. At this point, the copying process evaluates records, logs, or data generated and/or modified by the operating system while in incremental tracking mode and identifies the blocks that changed during the previous copy procedure, i.e., the copy procedure of step  406 . In some embodiments, the identified blocks include each block that was modified by write instructions after said each block had been copied to target volume  403 . As illustrated in  FIG. 4A , these identified blocks include the blocks at regions  408   a ,  408   b ,  408   c , and  408   d  in the source volume. 
     At step  410 , process  400  determines that the CoW mode should not be entered (e.g., the aggregate size of the blocks at regions  408   a ,  408   b ,  408   c , and  408   d  is greater than or equal to a threshold). Process  400  therefore does not enter copy-on-write mode, but instead proceeds to copy only the blocks identified in step  408  (i.e.,  408   a ,  408   b ,  408   c , and  408   d ) to the corresponding locations in target volume  403 . As a result, the portions  410   a ,  410   b ,  410   c , and  410   d  in target volume  403 , which correspond to the identified regions  408   a ,  408   b ,  408   c  and  408   d  in the source volume  402 , are updated to reflect the new state of these identified regions. If the rate at which data is being copied from source volume  402  to target volume  403  exceeds the rate at which data in source volume  402  is being changed by the operating system, the aggregate size of the identified regions  408   a ,  408   b ,  408   c , and  408   d  should be smaller than the size of the entire source volume  402 . Therefore, the copying process of step  410  will generally take less time than the copying process of step  406 . 
     At step  412 , process  400  verifies that the process of copying the blocks identified in step  408  is complete. At this point, the copying process again evaluates the records, logs, or data generated and/or modified by the operating system while in incremental tracking mode and identifies the blocks that changed during the previous copy procedure, i.e., the copy procedure of step  410 . In some embodiments, the identified blocks can include each block that was modified by write instructions after said each block had been copied to target volume  403 . As illustrated in  FIG. 4A , these identified blocks include the blocks at regions  412   a  and  412   b  in the source volume. 
     At step  414 , process  400  determines that the CoW mode should not be entered (e.g., the aggregate size of the blocks at regions  412   a  and  412   b  is greater than or equal to a threshold). Process  400  therefore does not enter copy-on-write mode, but instead proceeds to copy only the blocks identified in step  412  (i.e.,  412   a  and  412   b ) to the corresponding locations in target volume  403 . As a result, the portions  414   a  and  414   b  in target volume  403 , which correspond to the identified regions  412   a  and  412   b , are updated to reflect the new state of these identified regions. If the rate at which data is being copied from source volume  402  to target volume  403  exceeds the rate at which data in source volume  402  is being changed by the operating system, the aggregate size of the identified regions  412   a  and  412   b  should be smaller than the aggregate size of the regions  408   a ,  408   b ,  408   c , and  408   d  identified in step  408 . 
     At step  416 , process  400  verifies that the process of copying the blocks at regions  412   a  and  412   b  is complete. At this point, the copying process again evaluates the records, logs, or data generated and/or modified by the operating system while in incremental tracking mode and identifies the blocks that changed during the previous copy procedure, i.e., the copy procedure of step  414 . As illustrated in  FIG. 4A , these identified blocks include the blocks at region  416   a.    
     Turning to  FIG. 4B , at step  418 , process  400  determines that the CoW mode should be entered (e.g., the aggregate size of the blocks at region  416   a  is less than the threshold). As a result, process  400  enters copy-on-write mode in step  420 , then begins the process of copying the identified blocks at  416   a  to the target volume. 
     The operation of copy-on-write mode is illustrated at step  422 . While in copy-on-write mode, the operating system intercepts every write instruction (e.g., write  423 ) to the source volume before the write occurs. If the write would modify a block in source volume  402  that has not yet been copied to target volume  403 , the original contents of the to-be-modified block can first be preserved in CoW file  450 . For example, a copy of the original contents  452  can be stored in CoW file  450 . 
     As illustrated in step  424 , when process  400  attempts to copy a block that was modified by the operating system, process  400  can copy the original contents of that block (as preserved in CoW file  450 ) to the target volume. At the end of step  424 , the target volume  403  contains a crash-consistent snapshot of source volume  402 —this crash-consistent snapshot reflects the state of source volume  402  at the time that the operating system entered copy-on-write mode, in step  420 . After the end of step  424 , process  400  can optionally exit copy-on-write mode and turn off the incremental tracking mode. 
     As described above, the systems and methods taught herein can reduce the time spent in copy-on-write mode. This reduced time reduces the risk of unrecoverable problems that can occur during the copying process. For instance, in some embodiments, interruptions may occur in the copying process leading to a partial copy than cannot be accurately completed. Interruptions can be of a particular concern when data is being copied directly to the cloud. This is because copying data to the cloud requires network transmission, which may be compromised or complicated in the event of an interruption. Interruptions in the copying process occur due to a variety of factors or scenarios. During these scenarios, the copying process may or may not be running. For example, a breakdown in the network connection without causing a concurrent pause in the operation of the agent that is directing the copying. According to another exemplary scenario, the computer could be put to sleep or into a hibernation state, during which the network connection may break but during which the agent directing the copying is not running According to another exemplary scenario, the backup agent could be stopped by the user, during which the network is still functional but the agent directing the copying is not running According to another exemplary scenario, the computer on which the agent directing the copying resides may be shut down or rebooted (either cleanly or unexpectedly), during which the agent directing the copying may not be running but the network may still be functional. Other scenarios are contemplated. 
     The examples listed above can be broken up into two functional categories. In the first category, the agent directing the copying may be unaware that its operation was suspended. For example, when a computer hibernates, it may wake up in the same state it was in before hibernation. However, the network connection may have been broken during hibernation. In the second category, the agent directing the copying may be sufficiently aware of network failures (for example, that the software cannot connect to or communicate with the server anymore) or other interruption causing events (for example shutdowns and restarts). Thus, in the first category, to the agent directing the backup, it appears as if there is a temporary network failure. In response, the agent may attempt to reconnect to the server and continue the backup as if the interruption did not occur. 
     In the second category, during the interruption, the program continues to run and thus the agent can detect that the network connection was broken and attempts to reconnect to the server. In the case of the network disconnecting, the software may continue to try to connect to the server until a connection is re-established. In the case of shutdown or a restart of the computer running the software, the software may take note of the current state of the backup process and write the state of the backup to a disk. Accordingly, at the next restart, this state can be read from the disk and the system may reconnect to the server and continue sending data where it left off. This may also include recreating the snapshot the system was in the process of creating when in snapshot mode, as opposed to incremental tracking mode. 
       FIG. 5  shows a datagraph illustrating data flow(s) for the MBR. In  FIG. 5 , a client  502  (e.g., at a client site) may send a backup request  521  to a MBR server  506  to initiate a backup. For example, the client may be a desktop, a laptop, a tablet, a smartphone, a smartwatch, and/or the like that is executing a client application. In one implementation, the backup request may include data such as a request identifier, a device identifier, a client site identifier, a source volume identifier, blocks to be copied, a target volume identifier, finalization configuration settings, optimization configuration settings, and/or the like. In one embodiment, the client may provide the following example backup request, substantially in the form of a (Secure) Hypertext Transfer Protocol (“HTTP(S)”) POST message including eXtensible Markup Language (“XML”) formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /authrequest.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;auth_request&gt; 
               
               
                   &lt;timestamp&gt;2020-12-31 23:59:59&lt;/timestamp&gt; 
               
               
                   &lt;user_accounts_details&gt; 
               
               
                       &lt;user_account_credentials&gt; 
               
               
                           &lt;user_name&gt;JohnDaDoeDoeDoooe@gmail.com&lt;/user_name&gt; 
               
               
                           &lt;password&gt;abc123&lt;/password&gt; 
               
               
                           //OPTIONAL &lt;cookie&gt;cookieID&lt;/cookie&gt; 
               
               
                           //OPTIONAL &lt;digital_cert_link&gt;www.mydigitalcertificate.com/ 
               
               
                 JohnDoeDaDoeDoe@gmail.com/mycertifcate.dc&lt;/digital_cert_link&gt; 
               
               
                           //OPTIONAL &lt;digital_certificate&gt;_DATA_&lt;/digital_certificate&gt; 
               
               
                       &lt;/user_account_credentials&gt; 
               
               
                   &lt;/user_accounts_details&gt; 
               
               
                   &lt;client_details&gt; //iOS Client with App and Webkit 
               
               
                           //it should be noted that although several client details 
               
               
                           //sections are provided to show example variants of client 
               
               
                           //sources, further messages will include only on to save 
               
               
                           //space 
               
               
                       &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                       &lt;user_agent_string&gt;Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_1 like Mac OS X) 
               
               
                 AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D201 
               
               
                 Safari/9537.53&lt;/user_agent_string&gt; 
               
               
                       &lt;client_product_type&gt;iPhone6,1&lt;/client_product_type&gt; 
               
               
                       &lt;client_serial_number&gt;DNXXX1X1XXXX&lt;/client_serial_number&gt; 
               
               
                       &lt;client_UDID&gt;3XXXXXXXXXXXXXXXXXXXXXXXXD&lt;/client_UDID&gt; 
               
               
                       &lt;client_OS&gt;iOS&lt;/client_OS&gt; 
               
               
                       &lt;client_OS_version&gt;7.1.1&lt;/client_OS_version&gt; 
               
               
                       &lt;client_app_type&gt;app with webkit&lt;/client_app_type&gt; 
               
               
                       &lt;app_installed_flag&gt;true&lt;/app_installed_flag&gt; 
               
               
                       &lt;app_name&gt;MBR.app&lt;/app_name&gt; 
               
               
                       &lt;app_version&gt;1.0 &lt;/app_version&gt; 
               
               
                       &lt;app_webkit_name&gt;Mobile Safari&lt;/client_webkit_name&gt; 
               
               
                       &lt;client_version&gt;537.51.2&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt;//iOS Client with Webbrowser 
               
               
                       &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                       &lt;user_agent_string&gt;Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_1 like Mac OS X) 
               
               
                 AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D201 
               
               
                 Safari/9537.53&lt;/user_agent_string&gt; 
               
               
                       &lt;client_product_type&gt;iPhone6,1&lt;/client_product_type&gt; 
               
               
                       &lt;client_serial_number&gt;DNXXX1X1XXXX&lt;/client_serial_number&gt; 
               
               
                       &lt;client_UDID&gt;3XXXXXXXXXXXXXXXXXXXXXXXXD&lt;/client_UDID&gt; 
               
               
                       &lt;client_OS&gt;iOS&lt;/client_OS&gt; 
               
               
                       &lt;client_OS_version&gt;7.1.1&lt;/client_OS_version&gt; 
               
               
                       &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                       &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                       &lt;client_version&gt;9537.53&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt; //Android Client with Webbrowser 
               
               
                       &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                       &lt;user_agent_string&gt;Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; Nexus S 
               
               
                 Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile 
               
               
                 Safari/534.30&lt;/user_agent_string&gt; 
               
               
                       &lt;client_product_type&gt;Nexus S&lt;/client_product_type&gt; 
               
               
                       &lt;client_serial_number&gt;YXXXXXXXXZ&lt;/client_serial_number&gt; 
               
               
                       &lt;client_UDID&gt;FXXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXXX&lt;/client_UDID&gt; 
               
               
                       &lt;client_OS&gt;Android&lt;/client_OS&gt; 
               
               
                       &lt;client_OS_version&gt;4.0.4&lt;/client_OS_version&gt; 
               
               
                       &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                       &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                       &lt;client_version&gt;534.30&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt; //Mac Desktop with Webbrowser 
               
               
                       &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                       &lt;user_agent_string&gt;Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) 
               
               
                 AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 
               
               
                 Safari/537.75.14&lt;/user_agent_string&gt; 
               
               
                       &lt;client_product_type&gt;MacPro5,1&lt;/client_product_type&gt; 
               
               
                       &lt;client_serial_number&gt;YXXXXXXXXZ&lt;/client_serial_number&gt; 
               
               
                       &lt;client_UDID&gt;FXXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXXX&lt;/client_UDID&gt; 
               
               
                       &lt;client_OS&gt;Mac OS X&lt;/client_OS&gt; 
               
               
                       &lt;client_OS_version&gt;10.9.3&lt;/client_OS_version&gt; 
               
               
                       &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                       &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                       &lt;client_version&gt;537.75.14&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;backup_request&gt; 
               
               
                       &lt;request_identifier&gt;ID_request_1&lt;/request_identifier&gt; 
               
               
                       &lt;device_identifier&gt;ID_client_device_1&lt;/device_identifier&gt; 
               
               
                       &lt;client_site_identifier&gt;ID_client_X_site&lt;/client_site_identifier&gt; 
               
               
                       &lt;source_volume_identifier&gt;ID_source_device&lt;/source_volume_identifier&gt; 
               
               
                       &lt;blocks_to_copy&gt;ALL&lt;/blocks_to_copy&gt; 
               
               
                       &lt;target_volume_identifier&gt;ID_target_device&lt;/target_volume_identifier&gt; 
               
               
                       &lt;finalization_configuration_settings&gt; 
               
               
                       &lt;metric&gt;NUMBER_OF_PASSES &lt;= 10&lt;/metric&gt; 
               
               
                       &lt;metric&gt;DELTA_DATA: ASYMPTOTE (LAST 3 PASSES)&lt;/metric&gt; 
               
               
                           &lt;metric&gt;DELTA_TIME: ASYMPTOTE (HISTORICAL)&lt;/metric&gt; 
               
               
                           &lt;metric&gt;MAX_COMPLETION_TIME: 60 seconds&lt;/metric&gt; 
               
               
                       &lt;/finalization_configuration_settings&gt; 
               
               
                       &lt;predictive_optimization_configuration_settings&gt; 
               
               
                           &lt;setting&gt;HISTORICAL_CHANGE_FREQUENCY&lt;/setting&gt; 
               
               
                       &lt;/predictive_optimization_configuration_settings&gt; 
               
               
                       &lt;lookahead_optimization_configuration_settings&gt; 
               
               
                           &lt;setting&gt;ACCELERATED_COPY&lt;/setting&gt; 
               
               
                       &lt;/lookahead_optimization_configuration_settings&gt; 
               
               
                   &lt;/backup_request&gt; 
               
               
                 &lt;/auth_request&gt; 
               
               
                   
               
            
           
         
       
     
     The MBR server may send a performance logs retrieve request  525  to a repository  510  to retrieve pertinent backup performance characteristics logs. In one implementation, the performance logs retrieve request may include data such as a request identifier, a device identifier, a client site identifier, date and/or time specification, performance logs data specification, and/or the like. In one embodiment, the MBR server may provide the following example performance logs retrieve request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /performance_logs_retrieve_request.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;performance_logs_retrieve_request&gt; 
               
               
                   &lt;request_identifier&gt;ID_request_2&lt;/request_identifier&gt; 
               
               
                   &lt;device_identifier&gt;ID_client_device_1&lt;/device_identifier&gt; 
               
               
                   &lt;client_site_identifier&gt;ID_client_X_site&lt;/client_site_identifier&gt; 
               
               
                   &lt;day_of_week&gt;Wednesday&lt;/day_of_week&gt; 
               
               
                   &lt;performance_logs_data&gt; 
               
               
                      DELTA_TIME, HISTORICAL_CHANGE_FREQUENCY 
               
               
                   &lt;/performance_logs_data&gt; 
               
               
                 &lt;/performance_logs_retrieve_request&gt; 
               
               
                   
               
            
           
         
       
     
     The repository may send a performance logs retrieve response  529  to the MBR server with the requested performance logs data. In one implementation, the performance logs retrieve response may include data such as a response identifier, the requested performance logs data, and/or the like. In one embodiment, the repository may provide the following example performance logs retrieve response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 POST /performance_logs_retrieve_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;performance_logs_retrieve_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_2&lt;/response_identifier&gt; 
               
               
                   
                   &lt;performance_logs_data&gt;requested performance Logs 
               
               
                   
                   data&lt;/performance_logs_data&gt; 
               
               
                   
                 &lt;/performance_logs_retrieve_response&gt; 
               
               
                   
                   
               
            
           
         
       
     
     A backup processing (BP) component  533  may utilize data provided in the backup request to perform the backup. See  FIG. 3  for additional details regarding the BP component. In some implementations, the BP component may utilize a finalization settings determining (FSD) component  537  to determine when to enter the CoW mode based on the finalization configuration settings. See  FIG. 6  for additional details regarding the FSD component. In some implementations, the BP component may utilize a predictive optimization settings determining (POSD) component  538  to determine which blocks should be designated to be copied based on the predictive optimization configuration settings. See  FIG. 7  for additional details regarding the POSD component. In some implementations, the BP component may utilize a lookahead optimization settings determining (LOSD) component  539  to determine which blocks to copy during a pass based on the lookahead optimization configuration settings. See  FIG. 9  for additional details regarding the POSD component. 
     The MBR server may send a performance logs store request  541  to the repository to store backup performance characteristics logs associated with the backup. In one implementation, the performance logs store request may include data such as a request identifier, performance logs data, and/or the like. In one embodiment, the MBR server may provide the following example performance logs store request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 POST /performance_logs_store_request.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;performance_logs_store_request&gt; 
               
               
                   
                   &lt;request_identifier&gt;ID_request_3&lt;/request_identifier&gt; 
               
               
                   
                   &lt;performance_logs_data&gt;performance Logs data 
               
               
                   
                   for the backup&lt;/performance_logs_data&gt; 
               
               
                   
                 &lt;/performance_logs_store_request&gt; 
               
               
                   
                   
               
            
           
         
       
     
     The repository may send a performance logs store response  545  to the MBR server to confirm that the performance logs data was stored successfully. In one implementation, the performance logs store response may include data such as a response identifier, a status, and/or the like. In one embodiment, the repository may provide the following example performance logs store response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 POST /performance_logs_store_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;performance_logs_store_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_3&lt;/response_identifier&gt; 
               
               
                   
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                   
                 &lt;/performance_logs_store_response&gt; 
               
               
                   
                   
               
            
           
         
       
     
     The MBR server may send a backup response  549  to the client to inform the client whether the backup completed successfully. In one implementation, the backup response may include data such as a response identifier, a status, and/or the like. In one embodiment, the MBR server may provide the following example backup response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 POST /backup_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_1&lt;/response_identifier&gt; 
               
               
                   
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                   
                 &lt;/backup_response&gt; 
               
               
                   
                   
               
            
           
         
       
     
       FIG. 6  shows a logic flow illustrating embodiments of a finalization settings determining (FSD) component for the MBR. In  FIG. 6 , a finalization settings request may be obtained at  601 . For example, the finalization settings request may be obtained as a result of a request from the BP component to obtain finalization settings for a backup requested via a backup request. 
     Finalization configuration settings for a usage profile associated with the backup may be determined at  605 . In one embodiment, the finalization configuration settings may specify which metrics should be utilized to determine whether to enter the CoW mode. For example, the finalization configuration settings may indicate that the CoW mode should be entered when a specified metric or combination of metrics (e.g., based on logical operators such as AND, OR, NOT, etc.) has been satisfied. In one implementation, the backup request may be parsed (e.g., using PHP commands) to determine the specified finalization configuration settings. For example, the backup request may specify that number of passes, delta data between passes, delta time between passes, and maximum completion time metrics should be utilized to determine whether to enter the CoW mode. In another example, the backup request may specify a threshold value, which indicates when a metric has been satisfied, for each of the specified metrics (e.g., a threshold value for a metric may be specified as a constant (e.g., the number of passes metric is satisfied after 2 passes, or after 10 passes, or after 100 passes, etc. (e.g., determined based on previous experience regarding what number works well in practice)), a threshold value for a metric may be specified as a function or calculated parameter (e.g., the delta time between passes metric is satisfied when delta time reaches an asymptote) determined via statistical analysis of performance logs data (e.g., via a neural network)). In some embodiments, different finalization configuration settings may be utilized for the backup depending on the usage profile associated with the backup. For example, different finalization configuration settings may be utilized for different days (e.g., day of the week, weekday vs weekend), different times (e.g., time of day, working vs non-working hours), different entities (e.g., different client devices to be backed up (e.g., Client X Server 1 vs. Client X Server 2), different sites (e.g., Client X Site vs. Client Y Site), different customers (e.g., Client X vs. Client Y)), different number of users, and/or the like. Finalization configuration settings may vary with regard to metrics, metrics combinations, threshold values, and/or the like utilized for different usage profiles. In one implementation, a usage profile for the backup may be ascertained (e.g., based on data in the backup request, based on current date and/or time, etc.) and the finalization configuration settings for the usage profile may be determined (e.g., based on data stored in a database and/or based on data specified in the backup request). For example, the finalization configuration settings for the usage profile may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 SELECT usageProfileID, usageProfileFinalizationConfigurationSettings 
               
               
                 FROM UsageProfiles 
               
               
                 WHERE device_ID = ID_client_device_1 AND 
               
               
                 dayOfWeek = “Wednesday”; 
               
               
                   
               
            
           
         
       
     
     Pertinent performance logs may be retrieved at  609 . For example, the pertinent performance logs may include backup performance characteristics for the usage profile (e.g., backup performance characteristics logged by device ID_client_device_1 for previous backups that occurred on a Wednesday) that may be utilized to determine whether a specified metric (e.g., having a threshold value specified as a function or calculated parameter) has been satisfied. In one implementation, the pertinent performance logs for metrics specified via the finalization configuration settings may be retrieved from a database. For example, the pertinent performance logs may be retrieved via a MySQL database command similar to the following: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 SELECT passID, completionTimePerPass 
               
               
                 FROM PerformanceLogs 
               
               
                 WHERE device_ID = ID_client_device_1 AND 
               
               
                      matchingUsageProfileIDs LIKE ‘%’ + usageProfileID + ‘%’; 
               
               
                   
               
            
           
         
       
     
     A determination may be made at  621  whether the block size metric should be utilized by the backup to determine whether to enter the CoW mode (e.g., based on metrics specified via the finalization configuration settings). If so, finalization settings for the block size metric may be determined at  625  (e.g., based on a threshold specified via the finalization configuration settings). In one implementation, the finalization settings for the block size metric may specify that the block size metric is satisfied if the aggregate size of changed blocks in a pass is less than a threshold (e.g., 10 MB). The threshold may be a fixed aggregate size (e.g., expressed in units of storage such as megabytes, gigabytes, or terabytes), or may be a dynamic size calculated based on an available bandwidth between source volume and target volume, or the size of the source volume or target volume. For example, the threshold may be calculated by determining the maximum amount of data that may be transferred from the source volume to the target volume within a pre-defined target maximum time, given the available bandwidth between the two volumes, or the threshold may be calculated based on a pre-defined proportion of the total size of at least one of the source volume or target volume. Threshold calculations and/or various components (e.g., data transfer rate, available bandwidth) of such threshold calculations may be calculated based on data for the backup (e.g., based on data for the last pass, based on data over several passes) and/or based on historical data. If historical data is utilized, such calculations may be performed (e.g., calculated as an average, determined via statistical analysis by a neural network) as part of determining the finalization settings. If data for the backup is utilized, such calculations may be performed during the backup and may utilize pre-calculated components of threshold calculations that are based on historical data. In another implementation, the finalization settings for the block size metric may specify that the block size metric is satisfied if the number of changed blocks in a pass is less than a threshold (e.g., 500 blocks). 
     A determination may be made at  631  whether the number of passes metric should be utilized by the backup to determine whether to enter the CoW mode (e.g., based on metrics specified via the finalization configuration settings). If so, finalization settings for the number of passes metric may be determined at  635  (e.g., based on a threshold specified via the finalization configuration settings). In one implementation, the finalization settings for the number of passes metric may specify that the number of passes metric is satisfied if the number of passes for the backup exceeds a threshold (e.g., 5 passes). The threshold may be a fixed number or a dynamic number (e.g., calculated based on the average number of passes for a backup for the device on Wednesdays). Threshold calculations (e.g., using the function: the threshold is equal to 1.2 times historical average number of passes) and/or various components of such threshold calculations may be calculated based on data for the backup (e.g., based on data for the last pass, based on data over several passes) and/or based on historical data. If historical data is utilized, such calculations may be performed (e.g., calculated as an average, determined via statistical analysis by a neural network) as part of determining the finalization settings. If data for the backup is utilized, such calculations may be performed during the backup and may utilize pre-calculated components of threshold calculations that are based on historical data. 
     A determination may be made at  641  whether the delta data metric should be utilized by the backup to determine whether to enter the CoW mode (e.g., based on metrics specified via the finalization configuration settings). If so, finalization settings for the delta data metric may be determined at  645  (e.g., based on a threshold specified via the finalization configuration settings). In one implementation, the finalization settings for the delta data metric may specify that the delta data metric is satisfied if the change in the amount of data copied between passes (delta data) is less than a threshold (e.g., 1 MB). The threshold may be set using various criteria, such as it is more efficient to finish copying the data in one pass than to copy in several increments. Continually going back to copy small data increments may open the opportunity for more data changes during the copying, prolonging the backup process and decreasing efficiency. The threshold may be stated in alternative measures of size (e.g., number of blocks, bytes, bits). The threshold may be a fixed number or a dynamic number (e.g., a calculated parameter). For example, the threshold may be a calculated parameter that is satisfied if the change in the amount of data copied between passes (delta data) over several passes (e.g., over the last 3 passes) reaches an asymptote. Delta data calculations and/or various components (e.g., a trend function that may be used for predicting delta data for a pass) of such delta data calculations may be calculated based on data for the backup and/or based on historical data. For example, delta data for a pass may be calculated by determining a delta data trend function (e.g., linear, exponential) for the backup (e.g., based on the last 3 passes) and predicting delta data for the pass using the delta data trend function. 
     A determination may be made at  651  whether the delta time metric should be utilized by the backup to determine whether to enter the CoW mode (e.g., based on metrics specified via the finalization configuration settings). If so, finalization settings for the delta time metric may be determined at  655  (e.g., based on a threshold specified via the finalization configuration settings). In one implementation, the finalization settings for the delta time metric may specify that the delta time metric is satisfied if the change between passes in the amount of time to complete a pass (delta time) is less than a threshold (e.g., 5 seconds). The threshold may be set using various criteria, such as it is more efficient to finish copying the data in one pass than to copy in several increments. Continuing to copy small data increments once delta time reaches an asymptote may open the opportunity for more data changes during the copying, prolonging the backup process and decreasing efficiency. The threshold may incorporate a variety of factors (e.g., overall time to complete a pass, I/O time for a pass, transmission time for a pass). The threshold may be a fixed number or a dynamic number (e.g., a calculated parameter). For example, the threshold may be a calculated parameter that is satisfied if the change between passes in the amount of time to complete a pass (delta time) over several passes (e.g., over the last 3 passes) reaches an asymptote. Delta time calculations and/or various components (e.g., a trend function that may be used for predicting delta time for a pass) of such delta time calculations may be calculated based on data for the backup and/or based on historical data. For example, delta time for a pass may be calculated by determining a delta time trend function (e.g., linear, exponential) for the backup (e.g., based on historical data for the device on Wednesdays) and predicting delta time for the pass using the delta time trend function. 
     A determination may be made at  661  whether the pass completion time metric should be utilized by the backup to determine whether to enter the CoW mode (e.g., based on metrics specified via the finalization configuration settings). If so, finalization settings for the pass completion time metric may be determined at  665  (e.g., based on a threshold specified via the finalization configuration settings). In one implementation, the finalization settings for the pass completion time metric may specify that the pass completion time metric is satisfied if the pass completion time for a pass of the backup is less than a threshold (e.g., 60 seconds). The threshold may be a fixed number or a dynamic number (e.g., calculated based on a statistically determined (e.g., via a neural network) optimal threshold for the device on Wednesdays). Threshold calculations (e.g., using a neural network) and/or various components of such threshold calculations may be calculated based on data for the backup and/or based on historical data (e.g., based on historical data for the device on Wednesdays). 
     A determination may be made at  671  whether the resource intensity metric should be utilized by the backup to determine whether to enter the CoW mode (e.g., based on metrics specified via the finalization configuration settings). If so, finalization settings for the resource intensity metric may be determined at  675  (e.g., based on a threshold specified via the finalization configuration settings). In one implementation, the finalization settings for the resource intensity metric may specify that the resource intensity metric is satisfied if the resource load for a pass of the backup is less than a threshold (e.g., utilization percentage). The threshold may incorporate a variety of factors (e.g., CPU utilization, I/O utilization, network utilization, power utilization). The threshold may be a fixed number or a dynamic number (e.g., calculated based on a statistically determined (e.g., via a neural network) optimal threshold for the device on Wednesdays). Threshold calculations (e.g., using a neural network) and/or various components of such threshold calculations may be calculated based on data for the backup and/or based on historical data (e.g., based on historical data for the device on Wednesdays). 
     A determination may be made at  681  whether to optimize the combination of the specified metrics. In one embodiment, the finalization configuration settings may include a set of logical operators that specify how to evaluate the combination of the specified metrics to determine whether finalization settings have been satisfied. For example, the finalization configuration settings may specify that the finalization settings have been satisfied if the number of passes reaches a threshold of N (e.g., 10 passes) OR, for any pass &lt;N, if the pass completion time is less than a threshold of T (e.g., 60 seconds). Accordingly, no additional combination optimization may be utilized. In another embodiment, the finalization configuration settings may specify that the optimal combination of metrics should be determined. Accordingly, combination optimization may be utilized. 
     If combination optimization should be utilized, an optimal finalization settings combination may be determined at  685 . For example, the optimal finalization settings combination may be a combination that minimizes backup completion time, usage resource, and/or the like. In one implementation, a machine learning technique (e.g., a neural network) may be utilized to determine the optimal finalization settings combination. For example, historical data for the device on Wednesdays may be analyzed to determine which finalization settings combination minimizes backup completion time. 
     Finalization settings may be provided (e.g., to the BP component) at  691 . For example, the finalization settings may include the optimal finalization settings combination. In one implementation, the BP component may utilize the finalization settings to determine whether to enter the CoW mode as discussed with regard to the BP component at  308 . 
       FIG. 7  shows a logic flow illustrating embodiments of a predictive optimization settings determining (POSD) component for the MBR. In  FIG. 7 , a predictive optimization settings request may be obtained at  701 . For example, the predictive optimization settings request may be obtained as a result of a request from the BP component to obtain predictive optimization settings for a backup requested via a backup request. 
     A determination may be made at  705  whether predictive optimization should be utilized by the backup. By utilizing predictive optimization, the number of copy operations performed during the backup may be reduced. In one embodiment, predictive optimization may be utilized to configure the backup such that initial passes copy primarily the data blocks that tend to be more stable, while later passes copy the data blocks that tend to change more rapidly. As some data blocks, such as those that represent the operating system, applications and user data (e.g., pictures, video, audio), do not change often, while other data blocks, such as those that represent database entries and mail server files, tend to change rapidly, copying the rapidly changing blocks multiple times across iterations may be minimized by delaying their copying until a later pass. Additionally, the initial passes that do not copy the rapidly changing blocks may be copying fewer data blocks, hence may be performed more quickly. 
     If predictive optimization should not be utilized, the POSD component may indicate at  709  that all allocated and/or identified blocks should be included in a pass as discussed with regard to the BP component at  302  and/or  310 . 
     If predictive optimization should be utilized, optimization configuration settings for a usage profile associated with the backup may be determined at  713 . In one embodiment, the optimization configuration settings may specify how predictive optimization should be configured using a setting or a combination of settings (e.g., based on logical operators such as AND, OR, NOT, etc.). For example, the optimization configuration settings may indicate how (e.g., data attributes, historical trends) data blocks should be categorized into different frequency types (e.g., stable blocks, rapidly changing blocks). In one implementation, the backup request may be parsed (e.g., using PHP commands) to determine the specified optimization configuration settings. For example, the backup request may specify that historical change frequency associated with data blocks should be utilized to classify the data blocks into different frequency types. In another example, the backup request may specify the number of initial passes during which data blocks having a certain frequency type should not be copied (e.g., rapidly changing blocks should not be copied during the first two passes). It is to be understood that criteria such as number of passes, delta data between passes, delta time between passes, pass completion time, resource intensity, and/or the like may be utilized alone or in various combinations to determine when data blocks having a certain frequency type should be copied. In some embodiments, different optimization configuration settings may be utilized for the backup depending on the usage profile associated with the backup. For example, different optimization configuration settings may be utilized for different days (e.g., day of the week, weekday vs weekend), different times (e.g., time of day, working vs non-working hours), different entities (e.g., different client devices to be backed up (e.g., Client X Server 1 vs. Client X Server 2), different sites (e.g., Client X Site vs. Client Y Site), different customers (e.g., Client X vs. Client Y)), different number of users, and/or the like. Optimization configuration settings may vary with regard to settings, settings combinations, frequency types, number of initial passes for different frequency types, and/or the like utilized for different usage profiles. In one implementation, a usage profile for the backup may be ascertained (e.g., based on data in the backup request, based on current date and/or time, etc.) and the optimization configuration settings for the usage profile may be determined (e.g., based on data stored in a database and/or based on data specified in the backup request). For example, the optimization configuration settings for the usage profile may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT usageProfileID, 
               
               
                   
                 usageProfilePredictiveOptimizationConfigurationSettings 
               
               
                   
                 FROM UsageProfiles 
               
               
                   
                 WHERE device_ID = ID_client_device_1 AND dayOfWeek = 
               
               
                   
                 “Wednesday”; 
               
               
                   
                   
               
            
           
         
       
     
     Pertinent performance logs may be retrieved at  717 . For example, the pertinent performance logs may include backup performance characteristics for the usage profile (e.g., backup performance characteristics logged by device ID_client_device_1 for previous backups that occurred on a Wednesday) that may be utilized to categorize data blocks into different frequency types. In one implementation, the pertinent performance logs for settings specified via the optimization configuration settings may be retrieved from a database. For example, the pertinent performance logs may be retrieved via a MySQL database command similar to the following: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 SELECT passID, dataBlocksChangeFrequency 
               
               
                 FROM PerformanceLogs 
               
               
                 WHERE device_ID = ID_client_device_1 AND 
               
               
                      matchingUsageProfileIDs LIKE ‘%’ + usageProfileID + ‘%’; 
               
               
                   
               
            
           
         
       
     
     A determination may be made at  721  whether the stable blocks criteria should be utilized by the backup to categorize data blocks into different frequency types (e.g., based on settings specified via the predictive optimization configuration settings). If so, optimization settings for the stable blocks criteria may be determined at  725 . In one embodiment, the stable blocks criteria may be used to identify data blocks that are not likely to change based on data type, such as blocks from executable applications, operating system functions, and user data. In one implementation, the stable blocks optimization settings may specify a list of blocks classified as stable blocks (e.g., data blocks that satisfy the stable blocks criteria) and/or the number of initial passes during which data blocks not classified as stable blocks should not be copied (e.g., a number specified via the predictive optimization configuration settings, an optimal number determined by a neural network based on analysis of historical data). It is to be understood that stable blocks may be a single frequency type or may be subdivided into multiple frequency types (e.g., based on probability ranges of being stable blocks, based on the amount of time blocks are likely to remain unchanged). 
     A determination may be made at  731  whether the busy blocks criteria should be utilized by the backup to categorize data blocks into different frequency types (e.g., based on settings specified via the predictive optimization configuration settings). If so, optimization settings for the busy blocks criteria may be determined at  735 . In one embodiment, the busy blocks criteria may be used to identify data blocks that are likely to change more rapidly based on data type, such as files writtent to by heavily utilized applications that perform a significant amount of I/O (e.g., for a Microsoft Windows NTFS system the following may be categorized as busy blocks: NTFS transaction log journal, NTFS change journal, parts of the Master File Table; for a Microsoft SQL Server the following may be categorized as busy blocks: database files, transaction log). In one implementation, the busy blocks optimization settings may specify a list of blocks classified as busy blocks (e.g., data blocks that satisfy the busy blocks criteria) and/or the number of initial passes during which data blocks classified as busy blocks should not be copied (e.g., a number specified via the predictive optimization configuration settings, an optimal number determined by a neural network based on analysis of historical data). It is to be understood that busy blocks may be a single frequency type or may be subdivided into multiple frequency types (e.g., based on probability ranges of being busy blocks, based on the amount of time blocks are likely to remain unchanged). 
     A determination may be made at  741  whether the historical change frequency criteria should be utilized by the backup to categorize data blocks into different frequency types (e.g., based on settings specified via the predictive optimization configuration settings). If so, optimization settings for the historical change frequency criteria may be determined at  745 . In one embodiment, the historical change frequency criteria may be used to categorize data blocks into different frequency types based on write history associated with the data blocks. For example, a record of block writes may be kept (e.g., for a specified time period, such as for recent block writes) and analyzed (e.g., via statistical analysis by a neural network) to categorize data blocks into different frequency types (e.g., based on historical data for the device on Wednesdays). In one implementation, the historical change frequency optimization settings may specify how data blocks are classified into different frequency types and/or the number of initial passes during which data blocks associated with each frequency type should not be copied (e.g., numbers specified via the predictive optimization configuration settings, optimal numbers determined by a neural network based on analysis of historical data). 
     A determination may be made at  751  whether to optimize the combination of the specified settings. In one embodiment, the predictive optimization configuration settings may include a set of logical operators that specify how to evaluate the combination of the specified settings to determine how data blocks are classified into different frequency types. For example, the predictive optimization configuration settings may specify that data blocks not classified as stable blocks should not be copied during the first two passes unless classified as busy blocks, which should not be copied during the first three passes. Accordingly, no additional combination optimization may be utilized. In another embodiment, the predictive optimization configuration settings may specify that the optimal combination of settings should be determined. Accordingly, combination optimization may be utilized. 
     If combination optimization should be utilized, an optimal optimization settings combination may be determined at  755 . For example, the optimal optimization settings combination may be a combination that minimizes backup completion time, usage resource, and/or the like. In one implementation, a machine learning technique (e.g., a neural network) may be utilized to determine the optimal optimization settings combination. For example, historical data for the device on Wednesdays may be analyzed to determine which optimization settings combination minimizes the overall number of copy operations. 
     Predictive optimization settings may be provided (e.g., to the BP component) at  761 . For example, the predictive optimization settings may include the optimal predictive optimization settings combination. In one implementation, the BP component may utilize the predictive optimization settings to determine how designated blocks to copy should be adjusted for each pass as discussed with regard to the BP component at  302  and/or  310 . 
       FIGS. 8A-B  show implementation cases for the MBR. In  FIG. 8A , an exemplary embodiment in which predictive optimization is not utilized is illustrated. As shown at  801 , blocks 1-20 should be copied to backup and blocks 3, 4 (e.g., busy blocks) tend to change frequently. During the initial full copy phase, all allocated blocks are copied, resulting in 20 copy operations. Blocks 3-6, 10, 12-13, 15 changed while copying. As shown at  810 , since the full copy phase completed, blocks 3, 4, 7, 14 changed and are added to the list of blocks to copy. During the first pass of the incremental copy, the changed blocks 3-7, 10, 12-15 are copied, resulting in 10 copy operations. Blocks 1-5, 8, 12, 14, 19-20 changed while copying. As shown at  820 , during the second pass of the incremental copy, the changed blocks 1-5, 8, 12, 14, 19-20 are copied, resulting in 10 copy operations. Blocks 3, 4, 20 changed while copying. Since the number of changed blocks is below a threshold (e.g., 5 blocks) for entering the CoW mode, the CoW mode is entered. As shown at  830 , during the final pass of the incremental copy, the changed blocks 3, 4, 20 are copied using the CoW file, resulting in 3 copy operations. Thus, a total of 43 copy operations are performed during this backup. 
     In  FIG. 8B , an exemplary embodiment in which predictive optimization is utilized is illustrated. As shown at  840 , blocks 1-20 should be copied to backup and blocks 3, 4 (e.g., busy blocks) tend to change frequently. Predictive optimization is utilized to hold off copying the busy blocks until the CoW mode is entered. During the initial full copy phase, all allocated blocks except the busy blocks 3, 4 are copied, resulting in 18 copy operations. Blocks 3-6, 10, 12-13, 15 changed while copying. As shown at  850 , since the full copy phase completed, blocks 3, 4, 7, 14 changed and are added to the list of blocks to copy. During the first pass of the incremental copy, the changed blocks 5-7, 10, 12-15 are copied while the busy blocks 3, 4 are not copied, resulting in 8 copy operations. Blocks 1-5, 8, 12, 14, 19-20 changed while copying. As shown at  860 , during the second pass of the incremental copy, the changed blocks 1-2, 5, 8, 12, 14, 19-20 are copied while the busy blocks 3, 4 are not copied, resulting in 8 copy operations. Blocks 3, 4, 20 changed while copying. Since the number of changed blocks is below a threshold (e.g., 5 blocks) for entering the CoW mode, the CoW mode is entered and the busy blocks 3, 4 may now be copied. As shown at  870 , during the final pass of the incremental copy, the changed blocks 3, 4, 20 are copied using the CoW file, resulting in 3 copy operations. Thus, a total of 37 copy operations are performed during this backup using predictive optimization, resulting in a reduced overall number of copy operations. 
       FIG. 9  shows a logic flow illustrating embodiments of a lookahead optimization settings determining (LOSD) component for the MBR. In  FIG. 9 , a lookahead optimization settings request may be obtained at  901 . For example, the lookahead optimization settings request may be obtained as a result of a request from the BP component to obtain lookahead optimization settings for a backup requested via a backup request. 
     A determination may be made at  905  whether lookahead optimization should be utilized by the backup. By utilizing lookahead optimization, the number of passes utilized to complete the backup may be reduced and/or redundant copying may be avoided. In one embodiment, lookahead optimization (e.g., accelerated copy optimization) may be utilized to configure the backup such that data blocks that changed forward of the current position (e.g., position of the data block currently being read and copied) and that had not been marked as changed blocks at the start of a current pass are added to the designated blocks to copy. Since fewer changed blocks are copied in the subsequent pass, the threshold to enter the CoW mode may be reached faster, and the number of passes utilized to complete the backup may be reduced. In another embodiment, lookahead optimization (e.g., delayed copy optimization) may be utilized to configure the backup such that copying of data blocks that changed forward of the current position and that had been marked as changed blocks at the start of a current pass is skipped (e.g., because such blocks will be marked as changed blocks and copied in the subsequent pass). Since fewer changed blocks are copied in the current pass, redundant copying may be avoided. 
     If lookahead optimization should not be utilized, the LOSD component may indicate at  909  that the desiganted blocks should be copied in a pass as discussed with regard to the BP component at  304 . 
     If lookahead optimization should be utilized, optimization configuration settings for a usage profile associated with the backup may be determined at  913 . In one embodiment, the optimization configuration settings may specify how lookahead optimization should be configured using a setting or a combination of settings (e.g., based on logical operators such as AND, OR, NOT, etc.). For example, the optimization configuration settings may indicate which optimizations (e.g., accelerated copy optimization, delayed copy optimization) should be utilized. In one implementation, the backup request may be parsed (e.g., using PHP commands) to determine the specified optimization configuration settings. For example, the backup request may specify that accelerated copy optimization should be utilized during the backup. In another example, the backup request may specify a schedule for applying lookahead optimization to a read/copy position (e.g., periodically, after a predetermined period of time). It is to be understood that criteria such as number of passes, delta data between passes, delta time between passes, pass completion time, resource intensity, and/or the like may be utilized alone or in various combinations to determine the schedule for applying lookahead optimization. In some embodiments, different optimization configuration settings may be utilized for the backup depending on the usage profile associated with the backup. For example, different optimization configuration settings may be utilized for different days (e.g., day of the week, weekday vs weekend), different times (e.g., time of day, working vs non-working hours), different entities (e.g., different client devices to be backed up (e.g., Client X Server 1 vs. Client X Server 2), different sites (e.g., Client X Site vs. Client Y Site), different customers (e.g., Client X vs. Client Y)), different number of users, and/or the like. Optimization configuration settings may vary with regard to settings, settings combinations, and/or the like utilized for different usage profiles. In one implementation, a usage profile for the backup may be ascertained (e.g., based on data in the backup request, based on current date and/or time, etc.) and the optimization configuration settings for the usage profile may be determined (e.g., based on data stored in a database and/or based on data specified in the backup request). For example, the optimization configuration settings for the usage profile may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT usageProfileID, 
               
               
                   
                 usageProfileLookaheadOptimizationConfigurationSettings 
               
               
                   
                 FROM UsageProfiles 
               
               
                   
                 WHERE device_ID = ID_client_device_1 AND dayOfWeek = 
               
               
                   
                 “Wednesday”; 
               
               
                   
                   
               
            
           
         
       
     
     Pertinent performance logs may be retrieved at  917 . For example, the pertinent performance logs may include backup performance characteristics for the usage profile (e.g., backup performance characteristics logged by device ID_client_device_1 for previous backups that occurred on a Wednesday) that may be utilized to determine an optimal schedule for applying lookahead optimization (e.g., via a neural network based on analysis of historical data) that results in the best backup performance (e.g., fewest passes, fewest redundant blocks copied, quickest completion time). In one implementation, the pertinent performance logs for settings specified via the optimization configuration settings may be retrieved from a database. For example, the pertinent performance logs may be retrieved via a MySQL database command similar to the following: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 SELECT passID, dataPerPass, completionTimePerPass 
               
               
                 FROM PerformanceLogs 
               
               
                 WHERE device_ID = ID_client_device_1 AND 
               
               
                      matchingUsageProfileIDs LIKE ‘%’ + usageProfileID + ‘%’; 
               
               
                   
               
            
           
         
       
     
     A determination may be made at  921  whether accelerated copy optimization should be utilized by the backup (e.g., based on settings specified via the lookahead optimization configuration settings). If so, accelerated copy optimization settings may be determined at  925 . In one implementation, the accelerated copy optimization settings may specify a schedule that determines when accelerated copy optimization should be utilized (e.g., check the current read/copy position during a pass every 15 seconds). 
     A determination may be made at  931  whether delayed copy optimization should be utilized by the backup (e.g., based on settings specified via the lookahead optimization configuration settings). If so, delayed copy optimization settings may be determined at  935 . In one implementation, the delayed copy optimization settings may specify a schedule that determines when delayed copy optimization should be utilized (e.g., check the current read/copy position during a pass after every 10 megabytes copied). 
     A determination may be made at  941  whether to optimize the combination of the specified settings. In one embodiment, the lookahead optimization configuration settings may include a set of logical operators that specify how to evaluate the combination of the specified settings to determine which optimizations to use and/or when. For example, the lookahead optimization configuration settings may specify that the accelerated copy optimization but not the delayed copy optimization should be used for the backup. Accordingly, no additional combination optimization may be utilized. In another embodiment, the lookahead optimization configuration settings may specify that the optimal combination of settings should be determined. Accordingly, combination optimization may be utilized. 
     If combination optimization should be utilized, an optimal optimization settings combination may be determined at  945 . For example, the optimal optimization settings combination may be a combination that minimizes backup completion time, usage resource, and/or the like. In one implementation, a machine learning technique (e.g., a neural network) may be utilized to determine the optimal optimization settings combination. For example, historical data for the device on Wednesdays may be analyzed to determine which optimization settings combination minimizes the number of passes utilized to complete the backup. 
     Lookahead optimization settings may be provided (e.g., to the BP component) at  951 . For example, the lookahead optimization settings may include the optimal lookahead optimization settings combination. In one implementation, the BP component may utilize the lookahead optimization settings to determine how designated blocks to copy should be adjusted during each pass as discussed with regard to the BP component at  304 . 
       FIGS. 10A-C  show implementation cases for the MBR. In  FIG. 10A , an exemplary embodiment in which lookahead optimization is not utilized is illustrated. As shown at  1001 , blocks 1-20 should be copied to backup. During the initial full copy phase, all allocated blocks are copied, resulting in 20 copy operations. Blocks 5-6, 10, 12-13, 15 changed while copying. As shown at  1010 , since the full copy phase completed, blocks 3, 4, 7, 14 changed and are added to the list of blocks to copy. During the first pass of the incremental copy, the changed blocks 3-7, 10, 12-15 are copied, resulting in 10 copy operations. Blocks 1-2, 5, 8, 12, 14, 19-20 changed while copying. As shown at  1020 , during the second pass of the incremental copy, the changed blocks 1-2, 5, 8, 12, 14, 19-20 are copied, resulting in 8 copy operations. Blocks 3, 4, 20 changed while copying. Since the number of changed blocks is below a threshold (e.g., 5 blocks) for entering the CoW mode, the CoW mode is entered. As shown at  1030 , during the final pass of the incremental copy, the changed blocks 3, 4, 20 are copied using the CoW file, resulting in 3 copy operations. Thus, a total of 41 copy operations in 4 passes are performed during this backup. 
     In  FIG. 10B , an exemplary embodiment in which lookahead optimization is utilized is illustrated. In  FIG. 10B , accelerated copy optimization is utilized. As shown at  1040 , blocks 1-20 should be copied to backup. During the initial full copy phase, all allocated blocks are copied, resulting in 20 copy operations. Blocks 5-6, 10, 12-13, 15 changed while copying. As shown at  1050 , since the full copy phase completed, blocks 3, 4, 7, 14 changed and are added to the list of blocks to copy. During the first pass of the incremental copy, accelerated copy optimization is utilized to add blocks that changed forward of the current read and copy position (e.g., marked by the copy tracker at block 14) and that had not been marked as changed blocks at the start of the first pass to the designated blocks to copy. Thus, blocks 19-20 are added to the designated blocks to copy, and the changed blocks 3-7, 10, 12-15, 19-20 are copied, resulting in 12 copy operations. As a result, even though blocks 1-2, 5, 8, 12, 14, 19-20 changed while copying up to block 14, just blocks 1-2, 5, 8, 12 are marked as changed for the next pass. The accelerated copy optimization may similarly be applied in the next pass at  1060 . Alternatively, if the number of changed blocks is below a threshold (e.g., 5 blocks) for entering the CoW mode, the CoW mode is entered at  1060 . Thus, 3 passes are performed during this backup using lookahead optimization, resulting in a reduced number of passes utilized to complete the backup. 
     In  FIG. 10C , an exemplary embodiment in which lookahead optimization is utilized is illustrated. In  FIG. 10C , delayed copy optimization is utilized. As shown at  1070 , blocks 1-20 should be copied to backup. During the initial full copy phase, delayed copy optimization is utilized to skip copying of blocks that changed forward of the current read and copy position (e.g., marked by the copy tracker at block 11) and that had been marked as changed blocks at the start of the initial full copy phase. Since blocks 5-6, 10, 12-13, 15 changed while copying up to block 11, blocks 12-13, 15 are skipped, resulting in 17 copy operations. As shown at  1080 , since the full copy phase completed, blocks 3, 4, 7, 14 changed and are added to the list of blocks to copy. Thus, during the first pass of the incremental copy, blocks 3-7, 10, 12-15 are marked as changed blocks to copy. The delayed copy optimization may similarly be applied in this pass and/or in the next pass at  1090 . Thus, redundant copying is avoided (e.g., 17 copy operations at  1070  vs. 20 copy operations at  1001 ) during this backup using lookahead optimization, resulting in reduced resource usage. 
       FIGS. 11A-B  show a datagraph illustrating data flow(s) for the MBR. In  FIGS. 11A-B , a client  1102  (e.g., of an administrative user of an entity) may send a pairing request  1121  to a MBR source server  1106  to facilitate pairing services utilized by users (e.g., employees) of the entity (e.g., a company) to the MBR backup cloud. For example, the client may be a desktop, a laptop, a tablet, a smartphone, a smartwatch, and/or the like that is executing a client application. In one implementation, the pairing request may include data such as a request identifier, entity data, user data, service data, backup schedule, and/or the like. In one embodiment, the client may provide the following example pairing request, substantially in the form of a (Secure) Hypertext Transfer Protocol (“HTTP(S)”) POST message including eXtensible Markup Language (“XML”) formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /authrequest.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;auth_request&gt; 
               
               
                   &lt;timestamp&gt;2020-12-31 23:59:59&lt;/timestamp&gt; 
               
               
                   &lt;user_accounts_details&gt; 
               
               
                      &lt;user_account_credentials&gt; 
               
               
                         &lt;user_name&gt;JohnDaDoeDoeDoooe@gmail.com&lt;/user_name&gt; 
               
               
                         &lt;password&gt;abc123&lt;/password&gt; 
               
               
                         //OPTIONAL &lt;cookie&gt;cookieID&lt;/cookie&gt; 
               
               
                         //OPTIONAL &lt;digital_cert_link&gt;www.mydigitalcertificate.com/ 
               
               
                 JohnDoeDaDoeDoe@gmail.com/mycertifcate.dc&lt;/digital_cert_link&gt; 
               
               
                         //OPTIONAL &lt;digital_certificate&gt;_DATA_&lt;/digital_certificate&gt; 
               
               
                      &lt;/user_account_credentials&gt; 
               
               
                   &lt;/user_accounts_details&gt; 
               
               
                   &lt;client_details&gt; //iOS Client with App and Webkit 
               
               
                         //it should be noted that although several client details 
               
               
                         //sections are provided to show example variants of client 
               
               
                         //sources, further messages will include only on to save 
               
               
                         //space 
               
               
                      &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                      &lt;user_agent_string&gt;Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_1 like Mac OS X) 
               
               
                 AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D201 
               
               
                 Safari/9537.53&lt;/user_agent_string&gt; 
               
               
                      &lt;client_product_type&gt;iPhone6,1&lt;/client_product_type&gt; 
               
               
                      &lt;client_serial_number&gt;DNXXX1X1XXXX&lt;/client_serial_number&gt; 
               
               
                      &lt;client_UDID&gt;3XXXXXXXXXXXXXXXXXXXXXXXXD&lt;/client_UDID&gt; 
               
               
                      &lt;client_OS&gt;iOS&lt;/client_OS&gt; 
               
               
                      &lt;client_OS_version&gt;7.1.1&lt;/client_OS_version&gt; 
               
               
                      &lt;client_app_type&gt;app with webkite&lt;/client_app_type&gt; 
               
               
                      &lt;app_installed_flag&gt;true&lt;/app_installed_flag&gt; 
               
               
                      &lt;app_name&gt;MBR.app&lt;/app_name&gt; 
               
               
                      &lt;app_version&gt;1.0 &lt;/app_version&gt; 
               
               
                      &lt;app_webkit_name&gt;Mobile Safari&lt;/client_webkit_name&gt; 
               
               
                      &lt;client_version&gt;537.51.2&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt; //iOS Client with Webbrowser 
               
               
                      &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                      &lt;user_agent_string&gt;Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_1 like Mac OS X) 
               
               
                 AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D201 
               
               
                 Safari/9537.53&lt;/user_agent_string&gt; 
               
               
                      &lt;client_product_type&gt;iPhone6,1&lt;/client_product_type&gt; 
               
               
                      &lt;client_serial_number&gt;DNXXX1X1XXXX&lt;/client_serial_number&gt; 
               
               
                      &lt;client_UDID&gt;3XXXXXXXXXXXXXXXXXXXXXXXXD&lt;/client_UDID&gt; 
               
               
                      &lt;client_OS&gt;iOS&lt;/client_OS&gt; 
               
               
                      &lt;client_OS_version&gt;7.1.1&lt;/client_OS_version&gt; 
               
               
                      &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                      &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                      &lt;client_version&gt;9537.53&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt; //Android Client with Webbrowser 
               
               
                      &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                      &lt;user_agent_string&gt;Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; Nexus S 
               
               
                 Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile 
               
               
                 Safari/534.30&lt;/user_agent_string&gt; 
               
               
                      &lt;client_product_type&gt;Nexus S&lt;/client_product_type&gt; 
               
               
                      &lt;client_serial_number&gt;YXXXXXXXXZ&lt;/client_serial_number&gt; 
               
               
                      &lt;client_UDID&gt;FXXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXXX&lt;/client_UDID&gt; 
               
               
                      &lt;client_OS&gt;Android&lt;/client_OS&gt; 
               
               
                      &lt;client_OS_version&gt;4.0.4&lt;/client_OS_version&gt; 
               
               
                      &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                      &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                      &lt;client_version&gt;534.30&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt; //Mac Desktop with Webbrowser 
               
               
                      &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                      &lt;user_agent_string&gt;Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) 
               
               
                 AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 
               
               
                      Safari/537.75.14&lt;/user_agent_string&gt; 
               
               
                      &lt;client_product_type&gt;MacPro5,1&lt;/client_product_type&gt; 
               
               
                      &lt;client_serial_number&gt;YXXXXXXXXZ&lt;/client_serial_number&gt; 
               
               
                      &lt;client_UDID&gt;FXXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXXX&lt;/client_UDID&gt; 
               
               
                      &lt;client_OS&gt;Mac OS X&lt;/client_OS&gt; 
               
               
                      &lt;client_OS_version&gt;10.9.3&lt;/client_OS_version&gt; 
               
               
                      &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                      &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                      &lt;client_version&gt;537.75.14&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;pairing_request&gt; 
               
               
                     &lt;request_identifier&gt;ID_request_1&lt;/request_identifier&gt; 
               
               
                     &lt;entity_identifier&gt;ID_company_1&lt;/entity_identifier&gt; 
               
               
                     &lt;users&gt;ID_user_1, ID_user_2, ID_user_3&lt;/users&gt; 
               
               
                     &lt;backup_settings&gt; 
               
               
                      &lt;user&gt; 
               
               
                        &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                        &lt;service&gt; 
               
               
                         &lt;service_identifier&gt;ID_service_google_drive&lt;/service_identifier&gt; 
               
               
                         &lt;service_login_data&gt;user&#39;s username and password&lt;/service_login_data&gt; 
               
               
                         &lt;backup_schedule&gt;create a snapshot 2 times per day&lt;/backup_schedule&gt; 
               
               
                        &lt;/service&gt; 
               
               
                        &lt;service&gt; 
               
               
                         &lt;service_identifier&gt;ID_service_sharepoint&lt;/service_identifier&gt; 
               
               
                         &lt;service_login_data&gt;user&#39;s username and password&lt;/service_login_data&gt; 
               
               
                         &lt;backup_schedule&gt;create a snapshot 3 times per day&lt;/backup_schedule&gt; 
               
               
                        &lt;/service&gt; 
               
               
                      &lt;/user&gt; 
               
               
                      &lt;user&gt; 
               
               
                        &lt;user_identifier&gt;ID_user_2&lt;/user_identifier&gt; 
               
               
                        &lt;service&gt; 
               
               
                         &lt;service_identifier&gt;ID_service_onedrive&lt;/service_identifier&gt; 
               
               
                         &lt;service_login_data&gt;user&#39;s username and password&lt;/service_login_data&gt; 
               
               
                         &lt;backup_schedule&gt;create a snapshot 3 times per day&lt;/backup_schedule&gt; 
               
               
                        &lt;/service&gt; 
               
               
                        &lt;service&gt; 
               
               
                         &lt;service_identifier&gt;ID_service_sharepoint&lt;/service_identifier&gt; 
               
               
                         &lt;service_login_data&gt;user&#39;s username and password&lt;/service_login_data&gt; 
               
               
                         &lt;backup_schedule&gt;create a snapshot 3 times per day&lt;/backup_schedule&gt; 
               
               
                        &lt;/service&gt; 
               
               
                      &lt;/user&gt; 
               
               
                      ... 
               
               
                     &lt;/backup_settings&gt; 
               
               
                   &lt;/pairing_request&gt; 
               
               
                 &lt;/auth_request&gt; 
               
               
                   
               
            
           
         
       
     
     It is to be understood that although the pairing request was shown using username and password pairs for service authentication, other authentication methods may be used. In one implementation, an OAuth2 authentication scheme in which an entity (e.g., company) grants the MBR access to the data of their users (e.g., employees) may be utilized. Accordingly, service authentication may be performed via a client_id and client_secret, and a user&#39;s data may be accessed based on the user&#39;s username. 
     A service pairing (SP) component  1125  may utilize data provided in the pairing request to facilitate configuring pairing settings. See  FIG. 12  for additional details regarding the SP component. It is to be understood that, in some implementations, a separate MBR pairing server may be utilized to handle pairing requests from clients and to execute the SP component, instead of using the MBR source server. Such MBR pairing server would also facilitate providing the MBR source server with relevant backup schedules. 
     The MBR source server may send a pairing data store request  1126  to a mappings database  1110  to store the pairing settings. In one implementation, the pairing data store request may include data such as a request identifier, pairing settings, and/or the like. In one embodiment, the MBR source server may provide the following example pairing data store request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /pairing_data_store_request.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;pairing_data_store_request&gt; 
               
               
                   &lt;request_identifier&gt;ID_request_2&lt;/request_identifier&gt; 
               
               
                   &lt;pairing_settings&gt; 
               
               
                     &lt;settings&gt; 
               
               
                       &lt;account_identifier&gt;ID_company_1&lt;/account_identifier&gt; 
               
               
                       &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                       &lt;service_identifier&gt;ID_service_google_drive&lt;/service_identifier&gt; 
               
               
                       &lt;source_node_identifier&gt;ID_source_node&lt;/source_node_identifier&gt; 
               
               
                       &lt;source_node_volume&gt;ID_backup_volume&lt;/source_node_volume&gt; 
               
               
                       &lt;target_node_identifier&gt;ID_target_node&lt;/target_node_identifier&gt; 
               
               
                       &lt;target_node_volume&gt;ID_replication_volume&lt;/target_node_volume&gt; 
               
               
                     &lt;/settings&gt; 
               
               
                     &lt;settings&gt; 
               
               
                       &lt;account_identifier&gt;ID_company_1&lt;/account_identifier&gt; 
               
               
                       &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                       &lt;service_identifier&gt;ID_service_sharepoint&lt;/service_identifier&gt; 
               
               
                       &lt;source_node_identifier&gt;ID_source_node&lt;/source_node_identifier&gt; 
               
               
                       &lt;source_node_volume&gt;ID_backup_volume&lt;/source_node_volume&gt; 
               
               
                       &lt;target_node_identifier&gt;ID_target_node&lt;/target_node_identifier&gt; 
               
               
                       &lt;target_node_volume&gt;ID_replication_volume&lt;/target_node_volume&gt; 
               
               
                     &lt;/settings&gt; 
               
               
                     ... 
               
               
                   &lt;/pairing_settings&gt; 
               
               
                 &lt;/pairing_data_store_request&gt; 
               
               
                   
               
            
           
         
       
     
     The mappings database may confirm that the pairing settings were stored via a pairing data store response  1127 . 
     The MBR source server may send a pairing response  1129  to the client to inform the administrative user whether pairing settings were configured successfully and/or to request corrections. In one implementation, the pairing response may include data such as a response identifier, a status, and/or the like. In one embodiment, the MBR source server may provide the following example pairing response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 POST /pairing_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;pairing_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_1&lt;/response_identifier&gt; 
               
               
                   
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                   
                 &lt;/pairing_response&gt; 
               
               
                   
                   
               
            
           
         
       
     
     A service backup processing (SBP) component  1133  may utilize data provided in the pairing request to facilitate backing up SaaS data of a paired service and/or generating a replication notification. See  FIG. 13  for additional details regarding the SBP component. 
     The MBR source server may send a data sync request  1137  to a SaaS server  1104  to obtain SaaS data to be backed up. In one implementation, the data sync request may comprise a set of commands (e.g., specific to the paired service) that may facilitate logging in to access the associated user&#39;s data (e.g., using the MBR&#39;s client_id and client_secret (e.g., and the username of the associated user), using the associated user&#39;s credentials (e.g., username and password)), determining data that changed since the last backup (e.g., using timestamp data, using an API provided by the paired service), downloading SaaS data (e.g., available data, changed data), and/or the like. The SaaS server may send a data sync response  1141  to the MBR source server with the requested data. 
     A source replication (SR) component  1145  may (e.g., in response to the replication notification) utilize a snapshot of the backed-up SaaS data to facilitate sending a replication data stream to a MBR target server  1108 . See  FIG. 14  for additional details regarding the SR component. 
     The MBR source server may send a replication target request  1149  to a mappings database  1110  to facilitate determining the replication target node (e.g., the MBR target server) and/or replication target volume associated with the paired service. In one implementation, the replication target request may include data such as a request identifier, an entity identifier, a user identifier, a service identifier, a source node identifier, a source node volume, and/or the like. In one embodiment, the MBR source server may provide the following example replication target request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /replication_target_request.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;replication_target_request&gt; 
               
               
                   &lt;request_identifier&gt;ID_request_3&lt;/request_identifier&gt; 
               
               
                   &lt;account_identifier&gt;ID_company_1&lt;/account_identifier&gt; 
               
               
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   &lt;service_identifier&gt;ID_service_google_drive&lt;/service_identifier&gt; 
               
               
                   &lt;source_node_identifier&gt;ID_source_node 
               
               
                   &lt;/source_node_identifier&gt; 
               
               
                   &lt;source_node_volume&gt;ID_backup_volume 
               
               
                   &lt;/source_node_volume&gt; 
               
               
                 &lt;/replication_target_request&gt; 
               
               
                   
               
            
           
         
       
     
     The mappings database may send a replication target response  1153  to the MBR source server with the requested data. In one implementation, the replication target response may include data such as a response identifier, the requested data, and/or the like. In one embodiment, the mappings database may provide the following example replication target response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /replication_target_response.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;replication_target_response&gt; 
               
               
                   &lt;response_identifier&gt;ID_response_3&lt;/response_identifier&gt; 
               
               
                   &lt;target_node_identifier&gt;ID_target_node&lt;/target_node_identifier&gt; 
               
               
                   &lt;target_node_volume&gt;ID_replication —   
               
               
                  volume&lt;/target_node_volume&gt; 
               
               
                 &lt;/replication_target_response&gt; 
               
               
                   
               
            
           
         
       
     
     The MBR source server may send the replication data stream  1157  to the MBR target server to facilitate replication of the backed-up SaaS data. In one implementation, the replication data stream may include data such as multiplexed chunks representing serialized snapshot data corresponding to the backed-up SaaS data, multiplexed chunks representing serialized snapshot data corresponding to other users, services, etc., and/or the like data sent over a persistent connection (e.g., a TCP/IP connection). 
     A target replication (TR) component  1161  may utilize data provided in the replication data stream to facilitate replication of the backed-up SaaS data. See  FIG. 15  for additional details regarding the TR component. 
     The MBR target server may send a replication confirmation  1165  to the MBR source server to confirm that the backed-up SaaS data obtained via the replication data stream was replicated successfully. 
       FIG. 12  shows a logic flow illustrating embodiments of a service pairing (SP) component for the MBR. In  FIG. 12 , a service pairing request from an entity (e.g., a company, an organization, an individual user) may be obtained at  1201 . For example, the service pairing request from entity may be obtained as a result of an administrative user of the entity utilizing a MBR application, mobile app, website, and/or the like to pair a set of services for a set of users for backup via the MBR. It is to be understood that although the SP component is discussed in the context of back up and replication of SaaS data associated with services, other data (e.g., on a local client device) may be similarly paired for backup (e.g., including metadata) and replication via the MBR. 
     A determination may be made at  1205  whether there remain users to process. For example, multiple employees may be processed for a company. In another example, an individual user may be processed. In one implementation, each of the users specified in the service pairing request may be processed. If there remain users to process, the next user may be selected for processing at  1209 . 
     A determination may be made at  1213  whether there remain services to process. For example, the same services or different services may be paired for different users. In one implementation, each of the services specified in the service pairing request for the selected user may be processed. If there remain services to process, the next service may be selected for processing at  1217 . 
     Service identifying data for the selected service may be determined at  1221 . For example, the service identifying data may specify the name, location (e.g., website address), subsection of the selected user&#39;s SaaS data on the selected service to be backed up, and/or the like. In another example, the service identifying data may specify an identifier associated with the selected service that may be used to retrieve such data from a previously configured database. In one implementation, the service pairing request may be parsed (e.g., using PHP commands) to determine the service identifying data (e.g., based on the value of the service_identifier field). 
     Service authentication data for the selected service may be determined at  1225 . For example, the service authentication data may specify the MBR&#39;s client_id and client_secret that may be utilized to access SaaS data on the selected service, and a username of the selected user (e.g., which determines which SaaS data to access). In another example, the service authentication data may specify a username and password of the selected user that may be utilized to access the selected user&#39;s SaaS data on the selected service. In one implementation, the service pairing request may be parsed (e.g., using PHP commands) to determine the service authentication data (e.g., based on the value of the service_login_data field). 
     A service backup schedule may be determined at  1229 . For example, the service backup schedule may specify when the selected user&#39;s SaaS data on the selected service should be backed up via the MBR. In one implementation, the service pairing request may be parsed (e.g., using PHP commands) to determine the service backup schedule (e.g., based on the value of the backup_schedule field). 
     A backup volume for the selected service at a source node may be generated at  1233 . In one implementation, a backup volume may be a ZFS zvol (e.g., a virtual block device). In another implementation, a backup volume may be a ZFS dataset (e.g., a ZFS filesystem). Both a ZFS zvol and a ZFS dataset are snapshottable via ZFS and may be replicated via the MBR. For example, the source node may be the node executing the SP component or another node assigned for backup of the selected user&#39;s SaaS data on the selected service. In one embodiment, a separate backup volume may be created for each service utilized by a user. In another embodiment, a backup volume may be created for each user and may store the corresponding user&#39;s backed up SaaS data from services utilized by the corresponding user. In one implementation, the source node may be instructed to create a ZFS zvol (e.g., a simulated block device snapshotable via ZFS) backup volume. 
     A replication target node may be determined at  1237 . In one embodiment, the replication target node may be utilized to replicate the selected user&#39;s SaaS data to create a secure second copy. In one implementation, the replication target node may be assigned for a set of specified entities, users, services, and/or the like. In another implementation, the replication target node may be selected at random. In another implementation, the replication target node may be assigned prior to obtaining the service pairing request (e.g., during onboarding of the entity). For example, the entity may send a pairing request with a desired geographic datacenter, and may be paired with a source and target nodes in the desired geographic datacenter. It is to be understood that a node (e.g., a source node, a replication target node) may be configured to serve any combination of specified entities, users, services, and/or the like. 
     A replication volume for the selected service at the target node may be generated at  1241 . For example, the structure of the generated replication volumes may correspond to the structure of the generated backup volumes. In one implementation, the target node may be instructed to create a ZFS zvol (e.g., a simulated block device snapshotable via ZFS) or a ZFS dataset replication volume (e.g., corresponding to the backup volume). In an alternative embodiment, the replication volume may be created during the first replication event. 
     If there do not remain users to process, pairing configuration settings may be saved at  1245 . For example, the pairing configuration settings may include information regarding the entity, the users, the services, service backup schedules, mapping data that links a backup volume on a source node to a replication volume on a target node, and/or the like. In one implementation, the pairing configuration settings (e.g., a service backup schedule) may be saved in a configuration file (e.g., on the corresponding source node). In another implementation, the pairing configuration settings (e.g., mapping data that links a backup volume on a source node to a replication volume on a target node) may be saved in a database (e.g., via MySQL database commands). For example, pairing configuration settings for a paired service may be saved via a MySQL database command similar to the following: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 INSERT INTO Mappings (accountID, userID, serviceID, 
               
               
                 serviceAuthenticationDataForUser, 
               
               
                 serviceBackupScheduleForUser, sourceNodeID, 
               
               
                 sourceNodeBackupVolume, targetNodeID, 
               
               
                 targetNodeReplicationVolume) 
               
               
                 VALUES (ID_company_1, ID_user_1, ID_service_google_drive, 
               
               
                 “username and password”, “create a snapshot 2 times per day”, 
               
               
                 ID_source_node, ID_backup_volume, ID_target_node, 
               
               
                 ID_replication_volume); 
               
               
                   
               
            
           
         
       
     
       FIG. 13  shows a logic flow illustrating embodiments of a service backup processing (SBP) component for the MBR. In  FIG. 13 , a backup schedule may be checked at  1301  to determine whether it is time to backup SaaS data of a paired service (e.g., ID_service_google_drive) of a user (e.g., ID_user_1). In one implementation, a scheduler component on a source node executing the SBP component may send a notification when it is time to back up the service. It is to be understood that although the SBP component is discussed in the context of back up and replication of SaaS data associated with services, backups (e.g., including metadata) of other data (e.g., on a local client device) may be similarly processed. 
     If it is determined at  1305  that it is not yet time to back up the service, the MBR may wait at  1309  and check the backup schedule again at a later time. If it is determined at  1305  that it is time to back up the service, service identifying data may be retrieved at  1313 . For example, the retrieved service identifying data may include service location (e.g., website address), a specification of a subsection of the user&#39;s SaaS data on the service to be backed up, and/or the like. In one implementation, the service identifying data may be retrieved from a configuration file (e.g., on the source node). In another implementation, the service identifying data may be retrieved from a database (e.g., via MySQL database commands). For example, the service identifying data may be retrieved via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT serviceURL 
               
               
                   
                 FROM Services 
               
               
                   
                 WHERE serviceID = ID_service_google_drive; 
               
               
                   
                   
               
            
           
         
       
     
     Service authentication data may be retrieved at  1317 . For example, the retrieved service authentication data may include a username and password of the user that may be utilized to access the user&#39;s SaaS data on the service. In one implementation, the service authentication data may be retrieved from a configuration file (e.g., on the source node). In another implementation, the service authentication data may be retrieved from a database (e.g., via MySQL database commands). For example, the service authentication data may be retrieved via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT serviceAuthenticationDataForUser 
               
               
                   
                 FROM Mappings 
               
               
                   
                 WHERE accountID = ID_company_1 AND 
               
               
                   
                       userID = ID_user_1 AND 
               
               
                   
                       serviceID = ID_service_google_drive; 
               
               
                   
                   
               
            
           
         
       
     
     A network connection with the service may be established at  1321 . In one implementation, the source node may connect to the service (e.g., via the website address of the service, via a network share location, via an API provided by the service) and may utilize the user&#39;s username and password to log in. 
     The user&#39;s SaaS data on the service may be synchronized to the backup volume for the service at the source node at  1325 . For example, SaaS data may include documents (e.g., stored via Microsoft OneDrive), calendars (e.g., stored via Microsoft SharePoint), emails (e.g., stored via Microsoft Exchange), and/or the like. In one implementation, the entire contents of the user&#39;s SaaS data on the service (or the subsection of the user&#39;s SaaS data on the service to be backed up) may be copied. In another implementation, an incremental operation that copies the user&#39;s SaaS data that has changed since the previous backup may be performed. For example, a time (e.g., last changed time, created time, received time, sent time) associated with each SaaS data item may be checked and compared against the time of the previous backup to perform the incremental operation. In another example, an API provided by the service may be utilized to determine SaaS data items that had changed since the previous backup. In one implementation, the backup volume for the service may be determined from a configuration file (e.g., on the source node). In another implementation, the backup volume for the service may be determined from a database (e.g., via MySQL database commands). For example, the backup volume for the service may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT sourceNodeBackupVolume 
               
               
                   
                 FROM Mappings 
               
               
                   
                 WHERE accountID = ID_company_1 AND 
               
               
                   
                       userID = ID_user_1 AND 
               
               
                   
                       serviceID = ID_service_google_drive AND 
               
               
                   
                       sourceNodeID = ID_source_node; 
               
               
                   
                   
               
            
           
         
       
     
     A determination may be made at  1329  whether the user&#39;s SaaS data on the service changed since the last backup. If so, a snapshot of the backup volume for the service at the source node may be generated at  1333 . In one implementation, a ZFS snapshot of the zvol may be performed. For example, a snapshot may be utilized as a recovery point during a restore operation. 
     A replication notification may be generated at  1337 . For example, the replication notification may be utilized to indicate (e.g., to the SR component) that a snapshot of the backup volume was taken and should be replicated. In one implementation, the replication notification may be a Scala event object sent from the SBP component to the SR component. For example, the replication notification may include data as provided below: 
     
       
         
           
               
             
               
                   
               
               
                 Replication Notification 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                   
                 account_identifier: ID_company_1 
               
               
                   
                 user_identifier: ID_user_1 
               
               
                   
                 service_identifier: ID_service_google_drive 
               
               
                   
                 source_node_identifier: ID_source_node 
               
               
                   
                 source_node_volume: ID_backup_volume 
               
               
                   
                 snapshot_identifier: ID_snapshot_1 
               
               
                   
                   
               
            
           
         
       
     
       FIG. 14  shows a logic flow illustrating embodiments of a source replication (SR) component for the MBR. In  FIG. 14 , a replication notification may be obtained at  1401 . For example, the replication notification may be obtained as a result of the SBP component notifying the SR component that a snapshot of a backup volume was taken and should be replicated. 
     An entity identifier and/or a user identifier and/or a service identifier associated with the replication notification may be determined at  1405 . In one implementation, the replication notification may be parsed (e.g., using PHP commands) to determine the entity identifier and/or the user identifier and/or the service identifier (e.g., based on the values of the account_identifier field and/or the user_identifier field and/or the service_identifier field). 
     A replication target node associated with the replication notification may be determined at  1409 , and a replication volume associated with the replication notification may be determined at  1413 . In one embodiment, the replication target node and/or the replication volume may be determined based on any combination of the entity identifier and/or the user identifier and/or the service identifier. In one implementation, the replication target node and/or the replication volume may be retrieved from a mappings database (e.g., via MySQL database commands). For example, the replication target node and/or the replication volume may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT targetNodeID, targetNodeReplicationVolume 
               
               
                   
                 FROM Mappings 
               
               
                   
                 WHERE accountID = ID_company_1 AND 
               
               
                   
                       userID = ID_user_1 AND 
               
               
                   
                       serviceID = ID_service_google_drive; 
               
               
                   
                   
               
            
           
         
       
     
     In another embodiment, the replication target node and/or the replication volume may be determined (e.g., alternatively or additionally) based on any combination of a source node identifier and/or a backup volume identifier (e.g., based on the values of the source_node_identifier field and/or the source_node_volume field in the replication notification). For example, the replication target node and/or the replication volume may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT targetNodeID, targetNodeReplicationVolume 
               
               
                   
                 FROM Mappings 
               
               
                   
                 WHERE sourceNodeID = ID_source_node AND 
               
               
                   
                       source_node_volume = ID_backup_volume; 
               
               
                   
                   
               
            
           
         
       
     
     A determination may be made at  1417  whether a network connection with the replication target node has already been established. For example, a single persistent TCP/IP connection may be utilized to transfer multiplexed snapshot data from a plurality of snapshots for replication from the source node to the replication target node. If a network connection has not yet been established, a network connection with the replication target node may be established at  1421 . In one implementation, a TCP/IP connection may be established (e.g., using a network address associated with the target node identifier). In another implementation, a UDP connection may be established (e.g., using custom reliability and/or error-checking implementations). 
     A backup volume identifier of the backup volume and/or a snapshot identifier of the snapshot may be determined at  1425 . In one implementation, the replication notification may be parsed (e.g., using PHP commands) to determine the backup volume identifier and/or the snapshot identifier (e.g., based on the values of the source_node_volume field and/or the snapshot_identifier field). 
     A priority for the snapshot may be determined at  1433 . For example, snapshot priority may be used to determine how to order snapshot data from a plurality of snapshots for replication from the source node to the replication target node. In one implementation, the priority for the snapshot may be determined based on the latest backup volume replication timestamp (e.g., to give higher priority to the least recently replicated backup volumes). In another implementation, the priority for the snapshot may be determined based on snapshot size (e.g., to give higher priority to smaller snapshots). In another implementation, the priority for the snapshot may be determined based on the associated entity identifier and/or user identifier and/or service identifier (e.g., to give higher priority to snapshots from specified entities and/or users and/or services). It is to be understood that a variety of rules and/or combinations of rules may be utilized to determined priority. 
     The snapshot may be added to a set of snapshots (e.g., a priority queue of snapshots) to be transferred to the target node at  1437 . In one implementation, the backup volume identifier and/or the snapshot identifier of the snapshot may be added as an element with the determined priority to the priority queue of snapshots. 
     A determination may be made at  1441  whether it is time to send the snapshot to the replication target node. In one implementation, this determination may be made based on whether the element associated with the snapshot (e.g., comprising the backup volume identifier and/or the snapshot identifier and/or the priority of the snapshot) is the element of the priority queue with the highest priority. 
     If the element associated with the snapshot does not have the highest priority, a determination may be made at  1445  whether there are other snapshots of the backup volume in the priority queue (e.g., added while the snapshot was waiting to be sent). For example, if the backup volume is utilized to store SaaS data for a specific user, the priority queue may be searched for other snapshots of the backup volume that stores SaaS data for that user. In another example, if the backup volume is utilized to store SaaS data from a specific service, the priority queue may be searched for other snapshots of the backup volume that stores SaaS data for that service. If there are other snapshots of the backup volume, the priorities of the snapshots of the backup volume in the priority queue may be adjusted to combine snapshot data for transfer at  1449 . In one implementation, the priorities of the snapshots of the backup volume may be adjusted (e.g., made equal or similar) to improve transfer efficiency (e.g., to send snapshot data from multiple snapshots for the backup volume multiplexed in a data stream). 
     If the element associated with the snapshot does have the highest priority, a named pipe (e.g., FIFO) for the snapshot may be created at  1451 . In one implementation, the named pipe may be used to facilitate communication of the snapshot&#39;s data between MBR components. For example, the named pipe for the snapshot may be created as follows: 
                                            mkfifo fifo1           zfs send ID_backup_volume@ID_snapshot_1 &gt; fifo1                        
In some implementations, incremental snapshot data may be sent (e.g., using the zfs send -i option and a previously replicated snapshot).
 
     Snapshot data of the snapshot may be serialized into chunks at  1453 . In one implementation, protocol buffers (ProtoBufs) may be utilized (e.g., via Scala) to serialize the snapshot data into chunks. For example, Scala commands may be utilized to read the snapshot data from the named pipe created for the snapshot (e.g., fifo1) and to generate chunks as follows: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 Proto definition file 
               
               
                 syntax = “proto3”; 
               
               
                 message SendRecvMessage { 
               
               
                   string datasetId    = 1; 
               
               
                   string latestSnapshotId = 2; 
               
               
                   string recvResumeToken = 3; 
               
               
                   bytes data     = 4; 
               
               
                   enum MessageType { 
               
               
                     UNKNOWN    = 0; 
               
               
                     SEND_SYN   = 1; 
               
               
                     SEND_ACK   = 2; 
               
               
                     SEND_CHUNK  = 3; 
               
               
                     SEND_FIN    = 4; 
               
               
                   } 
               
               
                   MessageType messageType = 5; 
               
               
                 } 
               
               
                 Serializing snapshot data into chunks 
               
               
                 The following example code defines a Scala class that may be used to read snapshot data 
               
               
                 from a named pipe associated with the specified dataset and serialize it into chunks of 
               
               
                 a specified size on the replication source node. 
               
               
                 The getFifoPath function is a helper method returning the path to the named pipe(e.g., 
               
               
                 fifo1) derived from the datasetId. 
               
               
                 Each chunk is serialized as protocol buffer containing: 
               
               
                  1) A message type specifying that the protocol buffer should be interpreted as a 
               
               
                 chunk of snapshot data 
               
               
                  2) A datasetId identifying the ZFS dataset 
               
               
                  3) A byte array containing a chunk snapshot data for the associated dataset 
               
               
                 class FifoReader(datasetId: String, chunkSize: Int) { 
               
               
                  val buffer: Array[Byte] = new Array[Byte](chunkSize) 
               
               
                  val fifoPath: Path = getFifoPath(datasetId) 
               
               
                  val sendStream: InputStream = Files.newInputStream(fifoPath) 
               
               
                  def readSerializedChunk: Option[Array[Byte]] = { 
               
               
                   val read = sendStream.read(buffer, 0, chunkSize) 
               
               
                   if (read == −1) { 
               
               
                    None 
               
               
                   } else { 
               
               
                    val builder = SendRecvMessage.newBuilder( ) 
               
               
                    builder.setMessageType(SendRecvMessage.MessageType.SEND_CHUNK) 
               
               
                    builder.setDatasetId(datasetId) 
               
               
                    builder.setData(buffer) 
               
               
                    Some(builder.build.toByteArray) 
               
               
                   } 
               
               
                  } 
               
               
                 } 
               
               
                   
               
            
           
         
       
     
     The serialized snapshot data chunks may be multiplexed into a replication data stream at  1457 . For example, the SR component may be configured to transfer a specified number of snapshots (e.g., 3 snapshots) concurrently in the replication data stream via the network connection with the replication target node. In one implementation, chunks from one or more snapshots that are sent concurrently may be combined into the replication data stream as the chunks become available from the corresponding named pipes. For example, Scala commands may be utilized to combine the generated chunks into the replication data stream as follows: 
     
       
         
           
               
             
               
                   
               
               
                 Multiplexing data chunks 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
            
               
                 The following Scala code shows an example of how to instantiate a WebSocket client to a 
               
               
                 replication target node as well a function that utilizes the serialization code to read 
               
               
                 snapshot data from a named pipe, serialize the snapshot data into chunks, and send each 
               
               
                 chunk to the replication target node via the WebSocket. 
               
               
                 Scala threading or concurrency frameworks such as Akka may be used to create multiple 
               
               
                 threads to concurrently read, serialize, and send chunks from multiple datasets over 
               
               
                 the same WebSocket instance. 
               
               
                 val webSocket = new WebSocket(“wss://targetNode.com:9992”) 
               
               
                 def sendChunksOverWebSocket(webSocket: WebSocket, datasetId: String, chunkSize: int) = 
               
               
                 { 
               
               
                  val reader = new FifoReader(datasetId, chunkSize) 
               
               
                  var serializedChunk = reader.readSerializedChunk 
               
               
                  while (serializedChunk.isDefined) { 
               
               
                   webSocket.send(serializedChunk) 
               
               
                   serializedChunk = reader.readSerializedChunk 
               
               
                  } 
               
               
                 } 
               
               
                   
               
            
           
         
       
     
     A determination may be made at  1461  whether to use compression to compress the replication data stream. If so, the replication data stream may be compressed at  1465 . In one implementation, Zstandard (ZSTD) data compression algorithm may be utilized to compress the replication data stream. For example, utilizing data from multiple multiplexed snapshots to generate a compression dictionary may improve the compression ratio of the replication data stream. It is to be understood that compression may be applied to either individual chunks or to the replication data stream as a whole (e.g., to subsections of the replication data stream having a specified size). 
     The replication data stream may be sent to the replication target node at  1469 . In one implementation, the multiplexed chunks in the replication data stream may be sent over the network connection to the replication target node using a WebSocket connection. For example, Scala commands may be utilized to send the replication data stream using a WebSocket connection. 
       FIG. 15  shows a logic flow illustrating embodiments of a target replication (TR) component for the MBR. In  FIG. 15 , a network connection request from a source node may be obtained by a replication target node at  1501 . For example, the network connection request may be obtained as a result of the SR component on the source node requesting establishment of a network connection with the TR component on the replication target node to transfer multiplexed snapshot data from a plurality of snapshots for replication from the source node to the replication target node. 
     A network connection with the source node may be established at  1505 . In one implementation, a TCP/IP connection may be established. In another implementation, a UDP connection may be established. 
     A replication data stream from the source node may be obtained at  1509 . For example, the replication data stream may comprise multiplexed serialized snapshot data chunks of snapshots to be replicated. In one implementation, the multiplexed chunks in the replication data stream may be received over the network connection from the source node using WebSocket. For example, Scala commands may be utilized to receive the replication data stream using WebSocket. 
     A determination may be made at  1513  whether compression was used to compress the replication data stream. If so, the replication data stream may be decompressed at  1517 . In one implementation, Zstandard (ZSTD) data compression algorithm may be utilized to decompress the replication data stream. 
     A determination may be made at  1521  whether there remain chunks of the replication data stream to process. In one implementation, each of the chunks of the replication data stream may be processed. If there remain chunks to process, the next chunk may be selected for processing at  1525 . 
     The selected chunk may be deserialized at  1529 . In one implementation, protocol buffers (ProtoBufs) may be utilized (e.g., via Scala) to deserialize the selected chunk. For example, Scala commands may be utilized to deserialize the selected chunk as follows: 
     
       
         
           
               
             
               
                   
               
               
                 Deserializing snapshot data 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
            
               
                 The following example code defines a Scala class that may be used to deserialize chunks 
               
               
                 and write the snapshot data to a named pipe on the replication target node. 
               
               
                 The getFifoPath function is a helper method returning the path to the named pipe (e.g., 
               
               
                 fifo1) derived from the datasetId. 
               
               
                 class FifoWriter( ) { 
               
               
                  val recvStream: OutputStream = null 
               
               
                  def writeDeserializeChunk(serializedChunk: Array[Byte]): Unit = { 
               
               
                   val message = SendRecvMessage.parseFrom(serializedChunk) 
               
               
                   val messageType = deserializeChunk.getMessageType 
               
               
                   if (messageType == SendRecvMessage.MessageType.SEND_CHUNK) { 
               
               
                    if (recvStream == null) { 
               
               
                     val datasetId = message.getDatasetId 
               
               
                     val fifoPath = getFifoPath(datasetId) 
               
               
                     recvStream = Files.newOutputStream(fifoPath) 
               
               
                    } 
               
               
                    val snapshotChunk = message.getData 
               
               
                    recvStream.write(snapshotChunk) 
               
               
                   } 
               
               
                  } 
               
               
                 } 
               
               
                   
               
            
           
         
       
     
     A replication volume identifier of the replication volume (e.g., ID_replication_volume) and/or a snapshot identifier (e.g., ID_snapshot_1) of the snapshot associated with the selected chunk may be determined at  1533 . In one implementation, the selected chunk may be parsed (e.g., via Scala) to determine the replication volume identifier of the replication volume and/or the snapshot identifier of the snapshot. For example, the replication volume identifier may be provided by the source node based on data from a mappings database. In another implementation, the selected chunk may be parsed (e.g., via Scala) to determine a backup volume identifier of a backup volume associated with the selected chunk and/or the snapshot identifier of the snapshot. For example, the replication volume identifier may then be determined by the replication node (e.g., using the backup volume identifier and/or a source node identifier of the source node) based on data from a mappings database. 
     A determination may be made at  1537  regarding the chunk type of the selected chunk In one implementation, the selected chunk may be parsed (e.g., via Scala) to determine the chunk type. For example, the chunk type may be one of: handshake, snapshot data, end of send. 
     If the chunk type is handshake, an acknowledgement message may be sent to the source node at  1541 . In one implementation, a SEND-ACK message may be sent to indicate that the source node may send snapshot data. 
     If the chunk type is snapshot data, a named pipe (e.g., FIFO) for the snapshot associated with the selected chunk may be determined or created at  1551 . In one implementation, a mapping may be established between the replication volume identifier and/or the snapshot identifier of the snapshot, and the named pipe. For example, a Scala Map object may be utilized to establish the mapping. The mapping may be checked (e.g., using the get operation of the Scala Map object) to determine whether the named pipe for the snapshot has been previously created (e.g., when the first snapshot data chunk was received). 
     If the named pipe for the snapshot has not been created yet, the named pipe for the snapshot may be created and added to the mapping. In one implementation, the named pipe may be used to facilitate communication of the snapshot&#39;s data between MBR components. For example, the named pipe for the snapshot may be created as follows: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 mkfifo fifo1 
               
               
                   
                 zfs recv ID_replication_volume &lt; fifo1 
               
               
                   
                   
               
            
           
         
       
     
     The named pipe may be added to the mapping to establish an associated between the named pipe and the replication volume identifier of the replication volume and/or the snapshot identifier of the snapshot. 
     If the named pipe for the snapshot has been previously created, the named pipe associated with the chunk may be determined. In one implementation, the replication volume identifier and/or the snapshot identifier associated with the selected chunk may be utilized to determine the associated named pipe using the mapping (e.g., using the get operation of the Scala Map object). 
     Snapshot data in the selected chunk may be written to the associated named pipe at  1555 . For example, Scala commands may be utilized to write the snapshot data in the selected chunk to the associated named pipe (e.g., fifo1). 
     If the chunk type is end of send, a named pipe associated with the chunk may be determined at  1561 . In one implementation, the replication volume identifier and/or the snapshot identifier associated with the selected chunk may be utilized to determine the associated named pipe using the mapping (e.g., using the get operation of the Scala Map object). Writing to the associated named pipe may be finalized at  1565 . In one implementation, data indicating the end of snapshot data may be written to the named pipe. In another implementation, the named pipe may be deleted, removed from the mapping, and/or the like. 
     If the replication data stream has been processed, the network connection with the source node may be terminated at  1571 . In one implementation, the network connection may be terminated based on a request from the source node. In another implementation, the network connection may be terminated based on determining that there are no more chunks of the replication data stream to process. 
       FIG. 16  shows implementation case(s) for the MBR. In  FIG. 16 , exemplary implementation cases to facilitate replication of snapshot data are illustrated. At  1601 , an implementation case that does not utilize a replication data stream as discussed with regard to the SR and TR components is shown. To replicate snapshot data, a command (e.g., zfs list) may be utilized to iterate through backup volumes. Then a command (e.g., zfs list -t snapshot) may be utilized for each backup volume on both a source node and a replication target node to list snapshots associated with the corresponding backup volume. The snapshot lists on the source node and on the replication target node may be compared to determine incremental sends. Then a command (e.g., zfs send . . . | ssh zfs recv . . . ) may be utilized to replicate snapshot data. In this implementation case, it may take over 100K zfs list calls to do a full replication of a node. Further, since zfs send is bursty, multiple ssh tunnels may be taking up system resource during idle periods. 
     At  1610 , an implementation case that utilizes a replication data stream as discussed with regard to the SR and TR components is shown. When a backup completes on a source node, a SendActor (e.g., the SR component) is notified that a snapshot should be replicated to a replication target node. The SR component creates a named pipe for the snapshot at the source node (e.g., using commands: mkfifo fifo1 and zfs send . . . &gt;fifo1). A RecvActor (e.g., the TR component) creates a named pipe for the snapshot at the replication target node (e.g., using commands: mkfifo fifo1 and zfs recv . . . &lt;fifo1). The SR component is notified that snapshot data is available from the named pipe on the source node, reads chunks from the named pipe, and sends the chunks to the TR component (e.g., using WebSocket). The TR component is notified that snapshot data is available (e.g., on WebSocket), reads chunks, and writes the chunks to the named pipe on the replication target node. In this implementation case, iterating through backup volumes is eliminated and multiple snapshots are sent utilizing a single persistent connection (e.g., TCP/IP connection), improving utilization of system resources. 
       FIG. 17  shows implementation case(s) for the MBR. In  FIG. 17 , an exemplary implementation case to facilitate replication of snapshot data is illustrated. At  1701 , messages that may be sent during a replication event are shown. A SEND-SYNC message from a source node may initiate a handshake with payload containing the name of a backup volume on the source node. Alternatively, the payload may contain the name of a corresponding replication volume on a replication target node. A SEND_ACK message from the replication target node may include payload that contains either a receive_resume_token, most recent snapshot on the replication volume, or nothing. The source node may compute what to send and may send multiple SEND-CHUNK messages containing ZFS send data. A SEND-FIN message from the source node may signal end of send. In one implementation, message payloads may be encoded as protocol buffers (ProtoBufs). 
       FIG. 18  shows a datagraph illustrating data flow(s) for the MBR. In  FIG. 18 , a client  1802  (e.g., of an administrative user) may send a backup configuration request  1821  to a source device  1806  to facilitate configuring and/or executing backups of the source device. For example, the client may be a desktop, a laptop, a tablet, a smartphone, a smartwatch, and/or the like that is executing a client application. It is to be understood that, in some implementations, the client and the source device may be the same device. In one implementation, the backup configuration request may include data such as a request identifier, a user identifier, a paired backup device identifier, a backup schedule, recovery priority data, and/or the like. In one embodiment, the client may provide the following example backup configuration request, substantially in the form of a (Secure) Hypertext Transfer Protocol (“HTTP(S)”) POST message including eXtensible Markup Language (“XML”) formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /authrequest.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;auth_request&gt; 
               
               
                   &lt;timestamp&gt;2020-12-31 23:59:59&lt;/timestamp&gt; 
               
               
                   &lt;user_accounts_details&gt; 
               
               
                       &lt;user_account_credentials&gt; 
               
               
                           &lt;user_name&gt;JohnDaDoeDoeDoooe@gmail.com&lt;/user_name&gt; 
               
               
                           &lt;password&gt;abc123&lt;/password&gt; 
               
               
                           //OPTIONAL &lt;cookie&gt;cookieID&lt;/cookie&gt; 
               
               
                           //OPTIONAL &lt;digital_cert_link&gt;www.mydigitalcertificate.com/ 
               
               
                 JohnDoeDaDoeDoe@gmail.com/mycertifcate.dc&lt;/digital_cert_link&gt; 
               
               
                           //OPTIONAL &lt;digital_certificate&gt;_DATA_&lt;/digital_certificate&gt; 
               
               
                       &lt;/user_account_credentials&gt; 
               
               
                   &lt;/user_accounts_details&gt; 
               
               
                   &lt;client_details&gt; //iOS Client with App and Webkit 
               
               
                           //it should be noted that although several client details 
               
               
                           //sections are provided to show example variants of client 
               
               
                           //sources, further messages will include only on to save 
               
               
                           //space 
               
               
                       &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                       &lt;user_agent_string&gt;Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_1 like Mac OS X) 
               
               
                 AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D201 
               
               
                 Safari/9537.53&lt;/user_agent_string&gt; 
               
               
                       &lt;client_product_type&gt;iPhone6,1&lt;/client_product_type&gt; 
               
               
                       &lt;client_serial_number&gt;DNXXX1X1XXXX&lt;/client_serial_number&gt; 
               
               
                       &lt;client_UDID&gt;3XXXXXXXXXXXXXXXXXXXXXXXXD&lt;/client_UDID&gt; 
               
               
                       &lt;client_OS&gt;iOS&lt;/client_OS&gt; 
               
               
                       &lt;client_OS_version&gt;7.1.1&lt;/client_OS_version&gt; 
               
               
                       &lt;client_app_type&gt;app with webkit&lt;/client_app_type&gt; 
               
               
                       &lt;app_installed_flag&gt;true&lt;/app_installed_flag&gt; 
               
               
                       &lt;app_name&gt;MBR.app&lt;/app_name&gt; 
               
               
                       &lt;app_version&gt;1.0 &lt;/app_version&gt; 
               
               
                       &lt;app_webkit_name&gt;Mobile Safari&lt;/client_webkit_name&gt; 
               
               
                       &lt;client_version&gt;537.51.2&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt; //iOS Client with Webbrowser 
               
               
                       &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                       &lt;user_agent_string&gt;Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_1 like Mac OS X) 
               
               
                 AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D201 
               
               
                 Safari/9537.53&lt;/user_agent_string&gt; 
               
               
                       &lt;client_product_type&gt;iPhone6,1&lt;/client_product_type&gt; 
               
               
                       &lt;client_serial_number&gt;DNXXX1X1XXXX&lt;/client_serial_number&gt; 
               
               
                       &lt;client_UDID&gt;3XXXXXXXXXXXXXXXXXXXXXXXXD&lt;/client_UDID&gt; 
               
               
                       &lt;client_OS&gt;iOS&lt;/client_OS&gt; 
               
               
                       &lt;client_OS_version&gt;7.1.1&lt;/client_OS_version&gt; 
               
               
                       &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                       &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                       &lt;client_version&gt;9537.53&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt; //Android Client with Webbrowser 
               
               
                       &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                       &lt;user_agent_string&gt;Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; Nexus S 
               
               
                 Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile 
               
               
                 Safari/534.30&lt;/user_agent_string&gt; 
               
               
                       &lt;client_product_type&gt;Nexus S&lt;/client_product_type&gt; 
               
               
                       &lt;client_serial_number&gt;YXXXXXXXXZ&lt;/client_serial_number&gt; 
               
               
                       &lt;client_UDID&gt;FXXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXXX&lt;/client_UDID&gt; 
               
               
                       &lt;client_OS&gt;Android&lt;/client_OS&gt; 
               
               
                       &lt;client_OS_version&gt;4.0.4&lt;/client_OS_version&gt; 
               
               
                       &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                       &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                       &lt;client_version&gt;534.30&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;client_details&gt; //Mac Desktop with Webbrowser 
               
               
                       &lt;client_IP&gt;10.0.0.123&lt;/client_IP&gt; 
               
               
                       &lt;user_agent_string&gt;Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) 
               
               
                 AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 
               
               
                 Safari/537.75.14&lt;/user_agent_string&gt; 
               
               
                       &lt;client_product_type&gt;MacPro5,1&lt;/client_product_type&gt; 
               
               
                       &lt;client_serial_number&gt;YXXXXXXXXZ&lt;/client_serial_number&gt; 
               
               
                       &lt;client_UDID&gt;FXXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXXX&lt;/client_UDID&gt; 
               
               
                       &lt;client_OS&gt;Mac OS X&lt;/client_OS&gt; 
               
               
                       &lt;client_OS_version&gt;10.9.3&lt;/client_OS_version&gt; 
               
               
                       &lt;client_app_type&gt;web browser&lt;/client_app_type&gt; 
               
               
                       &lt;client_name&gt;Mobile Safari&lt;/client_name&gt; 
               
               
                       &lt;client_version&gt;537.75.14&lt;/client_version&gt; 
               
               
                   &lt;/client_details&gt; 
               
               
                   &lt;backup_configuration_request&gt; 
               
               
                     &lt;request_identifier&gt;ID_request_1&lt;/request_identifier&gt; 
               
               
                     &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                     &lt;backup_device_identifier&gt;ID_backup_device_1&lt;/backup_device_identifier&gt; 
               
               
                     &lt;backup_schedule&gt;create a snapshot 3 times per day&lt;/backup_schedule&gt; 
               
               
                     &lt;recovery_priority&gt; 
               
               
                       &lt;data_blocks&gt; 
               
               
                         &lt;type&gt;Operating System files&lt;/type&gt; 
               
               
                         &lt;priority&gt;10&lt;/priority&gt; 
               
               
                         &lt;essential&gt;Yes&lt;/essential&gt; 
               
               
                       &lt;/data_blocks&gt; 
               
               
                       &lt;data_blocks&gt; 
               
               
                         &lt;type&gt;Microsoft Word, Microsoft Excel&lt;/type&gt; 
               
               
                         &lt;priority&gt;9&lt;/priority&gt; 
               
               
                         &lt;essential&gt;Yes&lt;/essential&gt; 
               
               
                       &lt;/data_blocks&gt; 
               
               
                       &lt;data_blocks&gt; 
               
               
                         &lt;type&gt;User files for Word and Excel&lt;/type&gt; 
               
               
                         &lt;priority&gt;8&lt;/priority&gt; 
               
               
                         &lt;essential&gt;No&lt;/essential&gt; 
               
               
                       &lt;/data_blocks&gt; 
               
               
                       &lt;data_blocks&gt; 
               
               
                         &lt;type&gt;Microsoft Power Point&lt;/type&gt; 
               
               
                         &lt;priority&gt;7&lt;/priority&gt; 
               
               
                         &lt;essential&gt;No&lt;/essential&gt; 
               
               
                       &lt;/data_blocks&gt; 
               
               
                       &lt;data_blocks&gt; 
               
               
                         &lt;type&gt;User files for Power Point&lt;/type&gt; 
               
               
                         &lt;priority&gt;6&lt;/priority&gt; 
               
               
                         &lt;essential&gt;No&lt;/essential&gt; 
               
               
                       &lt;/data_blocks&gt; 
               
               
                       &lt;data_blocks&gt; 
               
               
                         &lt;type&gt;Other files&lt;/type&gt; 
               
               
                         &lt;priority&gt;data temporal locality&lt;/priority&gt; 
               
               
                         &lt;essential&gt;No&lt;/essential&gt; 
               
               
                       &lt;/data_blocks&gt; 
               
               
                     &lt;/recovery_priority&gt; 
               
               
                   &lt;/backup_configuration_request&gt; 
               
               
                 &lt;/auth_request&gt; 
               
               
                   
               
            
           
         
       
     
     A prioritized backup processing (PBP) component  1825  may utilize data provided in the backup configuration request to facilitate configuring and/or executing backups of the source device. See  FIG. 19  for additional details regarding the PBP component. 
     The source device may send a backup configuration response  1829  to the client to inform the administrative user whether backup settings were configured successfully and/or to request corrections. In one implementation, the backup configuration response may include data such as a response identifier, a status, and/or the like. In one embodiment, the source device may provide the following example backup configuration response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 POST /backup_configuration_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_configuration_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_1&lt;/response_identifier&gt; 
               
               
                   
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                   
                 &lt;/backup_configuration_response&gt; 
               
               
                   
                   
               
            
           
         
       
     
     The source device may send a backup data store request  1833  to a backup device  1810  to facilitate storing backup data. In one implementation, the backup data store request may include data such as a request identifier, a source device identifier, a user identifier, data blocks, a recovery prioritization index, and/or the like. In one embodiment, the source device may provide the following example backup data store request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /backup_data_store_request.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_data_store_request&gt; 
               
               
                   
                   &lt;request_identifier&gt;ID_request_2&lt;/request_identifier&gt; 
               
               
                   
                   &lt;source_device_identifier&gt;ID_source_device_1 
               
               
                   
                   &lt;/source_device_identifier&gt; 
               
               
                   
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   
                   &lt;data_blocks&gt;data blocks for backup (e.g., full, incremental) 
               
               
                   
                   &lt;/data_blocks&gt; 
               
               
                   
                   &lt;recovery_prioritization_index&gt; 
               
               
                   
                    recovery priorities for data blocks of the source device 
               
               
                   
                   &lt;/recovery_prioritization_index&gt; 
               
               
                   
                 &lt;/backup_data_store_request&gt; 
               
               
                   
               
            
           
         
       
     
     The backup device may send a backup data store response  1837  to the source device to confirm that the backup data was stored successfully. In one implementation, the backup data store response may include data such as a response identifier, a status, and/or the like. In one embodiment, the backup device may provide the following example backup data store response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /backup_data_store_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_data_store_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_2&lt;/response_identifier&gt; 
               
               
                   
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                   
                 &lt;/backup_data_store_response&gt; 
               
               
                   
               
            
           
         
       
     
       FIG. 19  shows a logic flow illustrating embodiments of a prioritized backup processing (PBP) component for the MBR. In  FIG. 19 , a backup configuration request may be obtained at  1901 . For example, the backup configuration request may be obtained as a result of an administrative user utilizing a MBR application, mobile app, website, and/or the like to configure backups of a user&#39;s source device (e.g., the source device may be a server, a workstation, a laptop, a mainframe computer, a virtual desktop, etc.). 
     A paired backup device may be determined at  1905 . For example, the backup device may be a local appliance or remote, such as cloud storage. In one implementation, the backup configuration request may be parsed (e.g., using PHP commands) to determine a specified backup device (e.g., based on the value of the backup_device_identifier field). In other implementations, a backup device may be assigned for a set of specified devices and/or users, assigned at random, assigned prior to obtaining the backup configuration request, and/or the like. 
     A determination may be made at  1909  whether a backup schedule was specified in the backup configuration request. If so, the specified backup schedule may be determined at  1913 . In one implementation, the backup configuration request may be parsed (e.g., using PHP commands) to determine the backup schedule (e.g., based on the value of the backup_schedule field). If not, a default backup schedule may be used. 
     A determination may be made at  1917  whether recovery priority information for data blocks was specified in the backup configuration request. If so, the specified recovery priorities for data blocks may be determined at  1921 . For example, recovery priorities for data blocks may be used to determine the order in which data blocks are fetched from the backup device during a recovery event. In one implementation, the backup configuration request may be parsed (e.g., using PHP commands) to determine recovery priorities for data blocks (e.g., based on the value of the recovery_priority field). For example, recovery priorities may be specified (e.g., via a GUI prompting for applications and/or files) by the administrative user for applications, files, etc. that may then be associated with data blocks (e.g., applications can be associated with their files, and files can be associated with data blocks though the file system, such as through Microsoft&#39;s File Allocation Table (FAT) or UNIX FFF (Fast File System) inode table). 
     A determination may be made at  1925  whether there remain data blocks to analyze. In one implementation, each of the data blocks (e.g., available to the user) of the source device may be analyzed. If there remain data blocks to analyze, the next data block may be selected for analysis at  1929 . 
     A data block recovery priority for the selected data block may be determined at  1933 . In one embodiment, certain data blocks may be considered essential. For example, essential data blocks may have to be loaded prior to booting the operating system of a recovery device, and/or may not have a separate recovery priority ranking In one implementation, data blocks associated with the operating system may be considered essential. In another implementation, data blocks associated with certain applications (e.g., crucial for the user&#39;s work) and/or high access datasets may be considered essential. In another embodiment, data block recovery priority may be determined based on temporal locality. In one implementation, the data block recovery priority for the selected data block may be determined based on the last time of use and/or frequency of use. For example, data blocks that were recently used and/or with high use frequency may be given a higher priority ranking, while data blocks with long times since last access and/or low frequency of use may be given a lower priority ranking. For example, the data block recovery priority for the selected data block may be determined as follows: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 Last time of use rank 
               
               
                 Last time of use rank = order of last time of use as compared to other 
               
               
                 data blocks 
               
               
                 Frequency of use rank 
               
               
                 Frequency of use rank = order of frequency of use as compared to other 
               
               
                 data blocks 
               
               
                 Recovery priority 
               
               
                 Recovery priority = (0.5)*(Last time of use rank) + (0.5)*(Frequency of 
               
               
                 use rank) 
               
               
                   
               
            
           
         
       
     
     A determination may be made at  1937  whether it is time to perform a backup. If it is not yet time to perform a backup, data block recovery priorities may be updated at  1941 . In one implementation, a software agent on the source device may create and/or update data block recovery priorities (e.g., a recovery prioritization index) of the data blocks on the source device storage. For example, data block recovery priorities may be updated to account for the user&#39;s use of the data blocks since the last time data block recovery priorities were updated. 
     If it is time to perform a backup, a recovery prioritization index may be generated at  1945 . In one implementation, data block recovery priorities may already be stored as a recovery prioritization index (e.g., in a file, in a database). The recovery prioritization index may be stored as a temporal index metric, may be reordered to form a convenient count, (e.g., a linear sequence, grouped sequence or sequence of groups), and/or the like. This optional re-ordering may be at the time the source device is backed up or some other convenient time. In another implementation, last access time and/or use frequency information may be stored for each data block, and the recovery prioritization index may be generated using this information by determining data block recovery priorities for the data blocks on the source device storage (e.g., available to the user). For example, the most recent access time of a data block or metric associated with that time may be used to determine the data block recovery priorities. Similarly, frequency of access of a data block may be monitored via a tally of accesses occurring over a certain period. That period may be long or short term, may be associated with the user&#39;s usage profile, work cycles, backup cycles, may be generated over some standard period of time and saved, and/or the like. The software agent may monitor disk and/or file usage to determine these recent accesses and/or access frequency. In some implementations, the data block recovery priorities may be updated when generating the recovery prioritization index. 
     Backup data may be sent to the backup device at  1949 . For example, the backup data may include data blocks to be backed up and/or the recovery prioritization index. In one implementation, the backup data may be stored via a backup data store request. In another implementation, the backup data may be stored via the BP component, SR component, and/or the like. In some implementations, the recovery prioritization index may be sent on a different schedule than the backup schedule (e.g., because exact up-to-the-minute recovery prioritization is not critical to gaining benefits of the system). 
       FIG. 20  shows a datagraph illustrating data flow(s) for the MBR. In  FIG. 20 , a client  2002  (e.g., of an administrative user) may send a restore request  2021  to a recovery device  2006  to facilitate restoring data to the recovery device (e.g., the recovery device may be the same as the source device associated with backed up data or a different device). For example, the client may be a desktop, a laptop, a tablet, a smartphone, a smartwatch, and/or the like that is executing a client application. It is to be understood that, in some implementations, the client and the recovery device may be the same device. In an alternative embodiment, the restore request may be sent by a recovery software agent based on a trigger (e.g., upon detecting that the source device is corrupted, crashed, is unreachable via network, etc.). In one implementation, the restore request may include data such as a request identifier, a backup device identifier, a source device identifier, a recovery point identifier (e.g., a snapshot identifier), a user identifier, and/or the like. In one embodiment, the client may provide the following example restore request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /restore_request.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;restore_request&gt; 
               
               
                   
                   &lt;request_identifier&gt;ID_request_11&lt;/request_identifier&gt; 
               
               
                   
                   &lt;backup_device_identifier&gt;ID_backup_device_1 
               
               
                   
                   &lt;/backup_device_identifier&gt; 
               
               
                   
                   &lt;source_device_identifier&gt;ID_source_device_1 
               
               
                   
                   &lt;/source_device_identifier&gt; 
               
               
                   
                   &lt;snapshot_identifier&gt;name or timestamp of snapshot 
               
               
                   
                   &lt;/snapshot_identifier&gt; 
               
               
                   
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   
                 &lt;/restore_request&gt; 
               
               
                   
               
            
           
         
       
     
     A prioritized restore processing (PRP) component  2025  may utilize data provided in the restore request to facilitate restoring data to the recovery device. See  FIG. 21  for additional details regarding the PRP component. 
     The recovery device may send a restore response  2029  to the client to inform the administrative user whether the restore request was processed successfully and/or to request corrections. In one implementation, the restore response may include data such as a response identifier, a status, and/or the like. In one embodiment, the recovery device may provide the following example restore response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /restore_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;restore_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_11&lt;/response_identifier&gt; 
               
               
                   
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                   
                 &lt;/restore_response&gt; 
               
               
                   
               
            
           
         
       
     
     The recovery device may send a backup data retrieve request  2033  to a backup device  2010  to facilitate restoring backup data. In one implementation, the backup data retrieve request may include data such as a request identifier, a recovery device identifier, a source device identifier, a recovery point identifier (e.g., a snapshot identifier), a user identifier, requested data blocks, and/or the like. In one embodiment, the recovery device may provide the following example backup data retrieve request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /backup_data_retrieve_request.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_data_retrieve_request&gt; 
               
               
                   
                   &lt;request_identifier&gt;ID_request_12&lt;/request_identifier&gt; 
               
               
                   
                   &lt;recovery_device_identifier&gt;ID_recovery_device_1 
               
               
                   
                   &lt;/recovery_device_identifier&gt; 
               
               
                   
                   &lt;source_device_identifier&gt;ID_source_device_1 
               
               
                   
                   &lt;/source_device_identifier&gt; 
               
               
                   
                   &lt;snapshot_identifier&gt;name or timestamp of snapshot 
               
               
                   
                   &lt;/snapshot_identifier&gt; 
               
               
                   
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   
                   &lt;requested_data_blocks&gt;data blocks to retrieve 
               
               
                   
                   &lt;/requested_data_blocks&gt; 
               
               
                   
                 &lt;/backup_data_retrieve_request&gt; 
               
               
                   
               
            
           
         
       
     
     The backup device may send a backup data retrieve response  2037  to the recovery device with the requested data blocks. In one implementation, the backup data retrieve response may include data such as a response identifier, the requested data blocks, and/or the like. In one embodiment, the backup device may provide the following example backup data retrieve response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /backup_data_retrieve_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_data_retrieve_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_12&lt;/response_identifier&gt; 
               
               
                   
                   &lt;requested_data_blocks&gt;retrieved data blocks 
               
               
                   
                   &lt;/requested_data_blocks&gt; 
               
               
                   
                 &lt;/backup_data_retrieve_response&gt; 
               
               
                   
               
            
           
         
       
     
       FIG. 21  shows a logic flow illustrating embodiments of a prioritized restore processing (PRP) component for the MBR. In  FIG. 21 , a restore request may be obtained by a recovery device at  2101 . For example, the restore request may be obtained as a result of an administrative user utilizing a MBR application, mobile app, website, and/or the like to facilitate restoring data to the recovery device (e.g., the recovery device may be a server, a workstation, a laptop, a mainframe computer, a virtual desktop, etc.). In another example, the restore request may be obtained from a recovery software agent as a result of a triggered event (e.g., upon detecting that a source device is corrupted, crashed, is unreachable via network, etc.). 
     A paired backup device may be determined at  2105 . For example, the backup device may be a local appliance or remote, such as cloud storage. In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified backup device (e.g., based on the value of the backup_device_identifier field). In another implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified source device (e.g., based on the value of the source_device_identifier field) and/or a specified user (e.g., based on the value of the user_identifier field), and the backup device associated with the source device and/or the user may be determined. 
     A recovery prioritization index for the restore operation may be obtained at  2109 . In one implementation, the recovery prioritization index may be retrieved from the backup device. For example, the recovery prioritization index may be obtained via a MySQL database command similar to the following: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 SELECT * 
               
               
                 FROM RecoveryPriorities 
               
               
                 WHERE source_device_ID = ID_source_device_1 AND user_ID = 
               
               
                 ID_user_1; 
               
               
                   
               
            
           
         
       
     
     Essential data blocks may be determined at  2113 . In one implementation, the recovery prioritization index may be analyzed to determine data blocks marked as essential. In another implementation, the recovery prioritization index may be analyzed to determine essential data blocks having a recovery priority ranking at or above a specified threshold (e.g., data blocks with recovery priority of 9 or above). In another implementation, operating system data blocks may be considered essential. 
     Essential data blocks may be fetched from the backup device at  2117 . In one implementation, the essential data blocks may be obtained via a backup data retrieve request. In some implementations, operating system data blocks may be loaded independently from other data blocks being fetched for the recovery device. 
     An operating system of the abridged recovery device may be booted at  2121 . In one embodiment, the recovery device may be considered abridged because the recovery device can operate after the essential data blocks are fetched, but before all data blocks are fetched. Operating the abridged recovery device allows the recovery time objective (RTO) to be reduced, allowing the user to utilize the recovery device faster. In one implementation, a software agent on the abridged recovery device may process requests to access data blocks (e.g., until the restore operation is complete). 
     A determination may be made at  2125  whether there remain more data blocks to fetch to complete the restore operation. If so, a determination may be made at  2129  whether a command was received (e.g., from the user). If a command was received, a determination may be made at  2133  whether command data blocks associated with the command have already been fetched. If the command data blocks have not yet been fetched, the command data blocks may be fetched at  2137 . In one implementation, the command data blocks may be obtained via a backup data retrieve request. In some implementations, the command data blocks may be fetched in batches that may be associated with an application or a data set. In some implementations, the command data blocks may be fetched in batches that improve the efficiency of reading and/or transmitting data blocks. The command data blocks may be utilized to execute the command at  2141 . 
     If a command was not received or if the command data blocks have already been fetched, a data block with the next highest recovery priority may be determined at  2145 . In one implementation, the recovery prioritization index may be analyzed to determine a remaining data block having the next highest recovery priority ranking. The data block with the next highest recovery priority may be fetched at  2149 . In one implementation, the data block with the next highest recovery priority may be obtained via a backup data retrieve request. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     Once there do not remain more data blocks to fetch to complete the restore operation, the recovery device may operate as a complete recovery device at  2153 . For example, the software agent may no longer be used to process requests to access data blocks. 
       FIG. 22  shows a datagraph illustrating data flow(s) for the MBR. In  FIG. 22 , a client  2202  (e.g., of an administrative user) may send a backup configuration request  2221  to a source device  2206  to facilitate configuring and/or executing backups of the source device. For example, the client may be a desktop, a laptop, a tablet, a smartphone, a smartwatch, and/or the like that is executing a client application. It is to be understood that, in some implementations, the client and the source device may be the same device. In one implementation, the backup configuration request may include data such as a request identifier, a user identifier, a paired backup device identifier, a backup schedule, source-nonspecific locations data, a precalculate discrepancy hashes flag, and/or the like. In one embodiment, the client may provide the following example backup configuration request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /backup_configuration_request.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_configuration_request&gt; 
               
               
                   
                   &lt;request_identifier&gt;ID_request_21&lt;/request_identifier&gt; 
               
               
                   
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   
                   &lt;backup_device_identifier&gt;ID_backup_device_1 
               
               
                   
                   &lt;/backup_device_identifier&gt; 
               
               
                   
                   &lt;backup_schedule&gt;create a snapshot 3 times per day 
               
               
                   
                   &lt;/backup_schedule&gt; 
               
               
                   
                   &lt;source_nonspecific_locations&gt; 
               
               
                   
                    &lt;sn_location&gt; 
               
               
                   
                      &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                   
                      &lt;location&gt;\\Windows10_Install_Disks&lt;/location&gt; 
               
               
                   
                    &lt;/sn_location&gt; 
               
               
                   
                    &lt;sn_location&gt; 
               
               
                   
                      &lt;data_identifier&gt;ID_MicrosoftWord&lt;/data_identifier&gt; 
               
               
                   
                      &lt;location&gt;D:\Word_Install_Disks&lt;/location&gt; 
               
               
                   
                    &lt;/sn_location&gt; 
               
               
                   
                    ... 
               
               
                   
                   &lt;/source_nonspecific_locations&gt; 
               
               
                   
                   &lt;precalculate_discrepancy_hashes&gt;YES 
               
               
                   
                   &lt;/precalculate_discrepancy_hashes&gt; 
               
               
                   
                 &lt;/backup_configuration_request&gt; 
               
               
                   
               
            
           
         
       
     
     A source-nonspecific backup processing (SNBP) component  2225  may utilize data provided in the backup configuration request to facilitate configuring and/or executing backups of the source device. See  FIG. 23  for additional details regarding the SNBP component. 
     The source device may send a backup configuration response  2229  to the client to inform the administrative user whether backup settings were configured successfully and/or to request corrections. In one implementation, the backup configuration response may include data such as a response identifier, a status, and/or the like. In one embodiment, the source device may provide the following example backup configuration response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /backup_configuration_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_configuration_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_21&lt;/response_identifier&gt; 
               
               
                   
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                   
                 &lt;/backup_configuration_response&gt; 
               
               
                   
               
            
           
         
       
     
     The source device may send a backup data store request  2233  to a backup device  2210  to facilitate storing backup data. In one implementation, the backup data store request may include data such as a request identifier, a source device identifier, a user identifier, data blocks, a source device configuration, source-nonspecific locations data, discrepancy hash data, and/or the like. In one embodiment, the source device may provide the following example backup data store request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /backup_data_store_request.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;backup_data_store_request&gt; 
               
               
                   &lt;request_identifier&gt;ID_request_22&lt;/request_identifier&gt; 
               
               
                   &lt;source_device_identifier&gt;ID_source_device_1 
               
               
                   &lt;/source_device_identifier&gt; 
               
               
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   &lt;data_blocks&gt;data blocks for backup (e.g., full, incremental) 
               
               
                   &lt;/data_blocks&gt; 
               
               
                   &lt;source_device_configuration&gt; 
               
               
                    &lt;operating_system&gt; 
               
               
                      &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                      &lt;data_description&gt;Windows 10, version 1809 
               
               
                      &lt;/data_description&gt; 
               
               
                    &lt;/operating_system&gt; 
               
               
                    &lt;application_software&gt; 
               
               
                      &lt;data_identifier&gt;ID_MicrosoftWord&lt;/data_identifier&gt; 
               
               
                      &lt;data_description&gt;Microsoft Word, version 2016 
               
               
                      &lt;/data_description&gt; 
               
               
                    &lt;/application_software&gt; 
               
               
                    ... 
               
               
                   &lt;/source_device_configuration&gt; 
               
               
                   &lt;source_nonspecific_locations&gt; 
               
               
                    &lt;sn_location&gt; 
               
               
                      &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                      &lt;location&gt;\\Windows10_Install_Disks&lt;/location&gt; 
               
               
                    &lt;/sn_location&gt; 
               
               
                    &lt;sn_location&gt; 
               
               
                      &lt;data_identifier&gt;ID_MicrosoftWord&lt;/data_identifier&gt; 
               
               
                      &lt;location&gt;D:\Word_Install_Disks&lt;/location&gt; 
               
               
                    &lt;/sn_location&gt; 
               
               
                    ... 
               
               
                   &lt;/source_nonspecific_locations&gt; 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                    &lt;discrepancy_hash&gt; 
               
               
                      &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                      &lt;data_block_identifier&gt;file1.exe&lt;/data_block_identifier&gt; 
               
               
                      &lt;data_block_hash&gt;hash of file1.exe&lt;/data_block_hash&gt; 
               
               
                    &lt;/discrepancy_hash&gt; 
               
               
                    &lt;discrepancy_hash&gt; 
               
               
                      &lt;data_identifier&gt;ID_MicrosoftWord&lt;/data_identifier&gt; 
               
               
                      &lt;data_block_identifier&gt;file2.docx&lt;/data_block_identifier&gt; 
               
               
                      &lt;data_block_hash&gt;hash of file2.docx&lt;/data_block_hash&gt; 
               
               
                    &lt;/discrepancy_hash&gt; 
               
               
                    ... 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                 &lt;/backup_data_store_request&gt; 
               
               
                   
               
            
           
         
       
     
     The backup device may send a backup data store response  2237  to the source device to confirm that the backup data was stored successfully. In one implementation, the backup data store response may include data such as a response identifier, a status, and/or the like. In one embodiment, the backup device may provide the following example backup data store response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /backup_data_store_response.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_data_store_response&gt; 
               
               
                   
                   &lt;response_identifier&gt;ID_response_22&lt;/response_identifier&gt; 
               
               
                   
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                   
                 &lt;/backup_data_store_response&gt; 
               
               
                   
               
            
           
         
       
     
       FIG. 23  shows a logic flow illustrating embodiments of a source-nonspecific backup processing (SNBP) component for the MBR. In  FIG. 23 , a backup configuration request may be obtained at  2301 . For example, the backup configuration request may be obtained as a result of an administrative user utilizing a MBR application, mobile app, website, and/or the like to configure backups of a user&#39;s source device (e.g., the source device may be a server, a workstation, a laptop, a mainframe computer, a virtual desktop, etc.). 
     Source device configuration may be determined at  2305 . For example, the source device configuration may identify software and/or configuration data (e.g., operating system, file system, application software, user data) stored on a data storage volume of the source device (e.g., the source device is running a Windows 10 operating system running particular software configured in a particular way). In one implementation, the data storage volume of the source device may be analyzed to generate a configuration table with the source device configuration. For example, installed operating system and application software may be determined (e.g., including version numbers) and stored in the configuration table. In another implementation, alternative techniques for identifying or associating source-specific and source-nonspecific data blocks relevant to a particular configuration may be utilized (e.g., a list of addresses that point to relevant material). 
     Associated source-nonspecific locations may be determined at  2309 . In one embodiment, data blocks of the source device that are backed up to a backup device (e.g., to a backup disk image file) are source-specific data blocks, while data blocks of interest in other locations are source-nonspecific data blocks. Such data blocks of interest are data blocks of the backup disk image file that can be found in equivalent form in locations other than the backup device. A data block in equivalent form is a source-nonspecific data block that contains the same information as a source-specific data block, but it is not the actual data block that was copied during the backup process. Examples may include data blocks associated with the operating system, file system, application software, and configuration files. For instance, the source computing device may be running a Windows 10 operating system. Data blocks associated with the Windows 10 operating system may be found on installation disks, a local server, local cloud, or on another local source such as a workstation or server on the LAN where a recovery device is located. In one embodiment, a property of the source-nonspecific data blocks is that they can be accessed from a location that provides a lower transmission time penalty compared to accessing the backup disk image file. For example, data blocks for a Windows 10 operating system may be copied more quickly from a local computer, server, or disk compared to the time it takes to takes to fetch Windows 10 data blocks from the backup disk image on a cloud via the Internet. In one implementation, the backup configuration request may be parsed (e.g., using PHP commands) to determine the associated source-nonspecific locations (e.g., based on the value of the source_nonspecific_locations field). For example, the associated source-nonspecific locations may be specified by the administrative user (e.g., via a GUI prompting for source-nonspecific locations to use). In another implementation, the associated source-nonspecific locations may be predetermined (e.g., for a set of devices on a LAN) and already stored in a separate location (e.g., at a backup device). 
     A paired backup device may be determined at  2313 . For example, the backup device may be a local appliance or remote, such as cloud storage. In one implementation, the backup configuration request may be parsed (e.g., using PHP commands) to determine a specified backup device (e.g., based on the value of the backup_device_identifier field). In other implementations, a backup device may be assigned for a set of specified devices and/or users, assigned at random, assigned prior to obtaining the backup configuration request, and/or the like. 
     A determination may be made at  2317  whether a backup schedule was specified in the backup configuration request. If so, the specified backup schedule may be determined at  2321 . In one implementation, the backup configuration request may be parsed (e.g., using PHP commands) to determine the backup schedule (e.g., based on the value of the backup_schedule field). If not, a default backup schedule may be used. 
     A determination may be made at  2325  whether to precalculate discrepancy hashes. In one embodiment, there may be differences between source-nonspecific data blocks and corresponding source-specific data blocks stored in the backup disk image. For example, some of the settings files of the Windows 10 operating system may be different (e.g., because the user changed a default setting). Accordingly, in one implementation, discrepancy hashes, checksums, or other compact representations of data blocks may be utilized to compare source-nonspecific data blocks and corresponding source-specific data blocks to determine whether such differences exist. Such hashing may be performed (e.g., by the source device, by the backup device) at recovery time or prior to recovery (e.g., at a time of low CPU use). In one implementation, discrepancy hashes may be precalculated to speed up recovery time and reduce RTO. For example, the administrative user may specify whether the discrepancy hashes should be precalculated (e.g., via the GUI). In one implementation, the backup configuration request may be parsed (e.g., using PHP commands) to determine whether the discrepancy hashes should be precalculated (e.g., based on the value of the precalculate_discrepancy_hashes field). 
     If the discrepancy hashes should be precalculated, a determination may be made at  2329  whether there remain data blocks to analyze. In one implementation, each of the data blocks (e.g., available to the user) of the source device may be analyzed. If there remain data blocks to analyze, the next data block may be selected at  2333 . 
     A data block discrepancy hash for the selected data block (e.g., for a file) may be determined at  2337 . In one implementation, a hash functions such as MD5, SHA-1, and/or the like may be utilized to calculate a hash of the selected data block of the source device. It is to be understood that discrepancy hashes may similarly be precalculated for data blocks stored at source-nonspecific locations. 
     A determination may be made at  2341  whether it is time to perform a backup. If it is not yet time to perform a backup, the precalculated discrepancy hashes may be updated at  2345 . In one implementation, a software agent on the source device may create and/or update discrepancy hashes of the data blocks on the source device storage. For example, data block discrepancy hashes may be updated to account for the user&#39;s use of the data blocks since the last time data block discrepancy hashes were updated. 
     If it is time to perform a backup, backup data may be sent to the backup device at  2349 . For example, the backup data may include data blocks to be backed up, the source device configuration, the associated source-nonspecific locations, the precalculated discrepancy hashes, and/or the like. In one implementation, the backup data may be stored via a backup data store request. In another implementation, the backup data may be stored via the BP component, SR component, and/or the like. 
       FIG. 24  shows a datagraph illustrating data flow(s) for the MBR. In  FIG. 24 , a client  2402  (e.g., of an administrative user) may send a restore request  2421  to a recovery device  2406  to facilitate restoring data to the recovery device (e.g., the recovery device may be the same as the source device associated with backed up data or a different device). For example, the client may be a desktop, a laptop, a tablet, a smartphone, a smartwatch, and/or the like that is executing a client application. It is to be understood that, in some implementations, the client and the recovery device may be the same device. In an alternative embodiment, the restore request may be sent by a recovery software agent based on a trigger (e.g., upon detecting that the source device is corrupted, crashed, is unreachable via network, etc.). In one implementation, the restore request may include data such as a request identifier, a backup device identifier, a source device identifier, a recovery point identifier (e.g., a snapshot identifier), a user identifier, a recovery device configuration, source-nonspecific locations data, and/or the like. In one embodiment, the client may provide the following example restore request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                   
                 POST /restore_request.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;restore_request&gt; 
               
               
                   
                   &lt;request_identifier&gt;ID_request_31&lt;/request_identifier&gt; 
               
               
                   
                   &lt;backup_device_identifier&gt;ID_backup_device_1 
               
               
                   
                   &lt;/backup_device_identifier&gt; 
               
               
                   
                   &lt;source_device_identifier&gt;ID_source_device_1 
               
               
                   
                   &lt;/source_device_identifier&gt; 
               
               
                   
                   &lt;snapshot_identifier&gt;name or timestamp of snapshot 
               
               
                   
                   &lt;/snapshot_identifier&gt; 
               
               
                   
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   
                   &lt;recovery_device_configuration&gt; 
               
               
                   
                    &lt;operating_system&gt; 
               
               
                   
                      &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                   
                      &lt;data_description&gt;Windows 10, version 1809 
               
               
                   
                      &lt;/data_description&gt; 
               
               
                   
                    &lt;/operating_system&gt; 
               
               
                   
                    &lt;application_software&gt; 
               
               
                   
                      &lt;data_identifier&gt;ID_MicrosoftWord&lt;/data_identifier&gt; 
               
               
                   
                      &lt;data_description&gt;Microsoft Word, version 2016 
               
               
                   
                      &lt;/data_description&gt; 
               
               
                   
                    &lt;/application_software&gt; 
               
               
                   
                    ... 
               
               
                   
                   &lt;/recovery_device_configuration&gt; 
               
               
                   
                   &lt;source_nonspecific_locations&gt; 
               
               
                   
                    &lt;sn_location&gt; 
               
               
                   
                      &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                   
                      &lt;location&gt;\\Windows10_Install_Disks&lt;/location&gt; 
               
               
                   
                    &lt;/sn_location&gt; 
               
               
                   
                    &lt;sn_location&gt; 
               
               
                   
                      &lt;data_identifier&gt;ID_MicrosoftWord&lt;/data_identifier&gt; 
               
               
                   
                      &lt;location&gt;D:\Word_Install_Disks&lt;/location&gt; 
               
               
                   
                    &lt;/sn_location&gt; 
               
               
                   
                    ... 
               
               
                   
                   &lt;/source_nonspecific_locations&gt; 
               
               
                   
                 &lt;/restore_request&gt; 
               
               
                   
               
            
           
         
       
     
     A source-nonspecific restore processing (SNRP) component  2425  may utilize data provided in the restore request to facilitate restoring data to the recovery device. See  FIG. 25  for additional details regarding the SNRP component. 
     The recovery device may send a source-nonspecific data retrieve request  2429  to a source-nonspecific location  2414  to fetch data blocks from the source-nonspecific location to facilitate restoring the recovery device. In one implementation, the source-nonspecific data retrieve request may include data such as a request identifier, a data identifier, a data description, and/or the like. In one embodiment, the recovery device may provide the following example source-nonspecific data retrieve request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /source_nonspecific_data_retrieve_request.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;source_nonspecific_data_retrieve_request&gt; 
               
               
                   &lt;request_identifier&gt;ID_request_32&lt;/request_identifier&gt; 
               
               
                   &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                   &lt;data_description&gt;Windows 10, version 1809&lt;/data_description&gt; 
               
               
                 &lt;/source_nonspecific_data_retrieve_request&gt; 
               
               
                   
               
            
           
         
       
     
     The source-nonspecific location may send a source-nonspecific data retrieve response  2433  to the recovery device with the requested data blocks. In one implementation, the source-nonspecific data retrieve response may include data such as a response identifier, the requested data, discrepancy hashes, and/or the like. In one embodiment, the source-nonspecific location may provide the following example source-nonspecific data retrieve response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /source_nonspecific_data_retrieve_response.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;source_nonspecific_data_retrieve_response&gt; 
               
               
                   &lt;response_identifier&gt;ID_response_32&lt;/response_identifier&gt; 
               
               
                   &lt;requested_data&gt;Windows 10, version 1809 install files 
               
               
                   &lt;/requested_data&gt; 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                    &lt;discrepancy_hash&gt; 
               
               
                      &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                      &lt;data_block_identifier&gt;file1.exe&lt;/data_block_identifier&gt; 
               
               
                      &lt;data_block_hash&gt;hash of file1.exe&lt;/data_block_hash&gt; 
               
               
                    &lt;/discrepancy_hash&gt; 
               
               
                    &lt;discrepancy_hash&gt; 
               
               
                      &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                      &lt;data_block_identifier&gt;file3.exe&lt;/data_block_identifier&gt; 
               
               
                      &lt;data_block_hash&gt;hash of file3.exe&lt;/data_block_hash&gt; 
               
               
                    &lt;/discrepancy_hash&gt; 
               
               
                    ... 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                 &lt;/source_nonspecific_data_retrieve_response&gt; 
               
               
                   
               
            
           
         
       
     
     The recovery device may send a backup data retrieve request  2437  to a backup device  2410  to facilitate restoring backup data. In one implementation, the backup data retrieve request may include data such as a request identifier, a recovery device identifier, a source device identifier, a recovery point identifier (e.g., a snapshot identifier), a user identifier, requested data blocks, and/or the like. In one embodiment, the recovery device may provide the following example backup data retrieve request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 POST /backup_data_retrieve_request.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_data_retrieve_request&gt; 
               
               
                   
                   &lt;request_identifier&gt;ID_request_33&lt;/request_identifier&gt; 
               
               
                   
                   &lt;recovery_device_identifier&gt;ID_recovery_device_1&lt;/ 
               
               
                   
                   recovery_device_identifier&gt; 
               
               
                   
                   &lt;source_device_identifier&gt;ID_source_device_1&lt;/ 
               
               
                   
                   source_device_identifier&gt; 
               
               
                   
                   &lt;snapshot_identifier&gt;name or timestamp of snapshot&lt;/ 
               
               
                   
                   snapshot_identifier&gt; 
               
               
                   
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   
                   &lt;requested_data_blocks&gt;data blocks to retrieve&lt;/ 
               
               
                   
                   requested_data_blocks&gt; 
               
               
                   
                 &lt;/backup_data_retrieve_request&gt; 
               
               
                   
                   
               
            
           
         
       
     
     The backup device may send a backup data retrieve response  2441  to the recovery device with the requested data blocks. In one implementation, the backup data retrieve response may include data such as a response identifier, the requested data blocks, discrepancy hashes, and/or the like. In one embodiment, the backup device may provide the following example backup data retrieve response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /backup_data_retrieve_response.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;backup_data_retrieve_response&gt; 
               
               
                   &lt;response_identifier&gt;ID_response_33&lt;/response_identifier&gt; 
               
               
                   &lt;requested_data_blocks&gt;retrieved data blocks&lt;/ 
               
               
                   requested_data_blocks&gt; 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                     &lt;discrepancy_hash&gt; 
               
               
                       &lt;data_block_identifier&gt;user_file4.docx&lt;/ 
               
               
                       data_block_identifier&gt; 
               
               
                       &lt;data_block_hash&gt;hash of user_file4.docx&lt;/ 
               
               
                       data_block_hash&gt; 
               
               
                     &lt;/discrepancy_hash&gt; 
               
               
                     &lt;discrepancy_hash&gt; 
               
               
                       &lt;data_block_identifier&gt;user_file5.docx&lt;/ 
               
               
                       data_block_identifier&gt; 
               
               
                       &lt;data_block_hash&gt;hash of user_file5.docx&lt;/ 
               
               
                       data_block_hash&gt; 
               
               
                     &lt;/discrepancy_hash&gt; 
               
               
                     ... 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                 &lt;/backup_data_retrieve_response&gt; 
               
               
                   
               
            
           
         
       
     
     The recovery device may send a restore response  2445  to the client to inform the user whether the restore operation completed successfully. In one implementation, the restore response may include data such as a response identifier, a status, and/or the like. In one embodiment, the recovery device may provide the following example restore response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /restore_response.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;restore_response&gt; 
               
               
                   &lt;response_identifier&gt;ID_response_31&lt;/response_identifier&gt; 
               
               
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                 &lt;/restore_response&gt; 
               
               
                   
               
            
           
         
       
     
       FIG. 25  shows a logic flow illustrating embodiments of a source-nonspecific restore processing (SNRP) component for the MBR. In  FIG. 25 , a restore request may be obtained by a recovery device at  2501 . For example, the restore request may be obtained as a result of an administrative user utilizing a MBR application, mobile app, website, and/or the like to facilitate restoring data to the recovery device (e.g., the recovery device may be a server, a workstation, a laptop, a mainframe computer, a virtual desktop, etc.). In another example, the restore request may be obtained from a recovery software agent as a result of a triggered event (e.g., upon detecting that a source device is corrupted, crashed, is unreachable via network, etc.). 
     A paired backup device may be determined at  2505 . For example, the backup device may be a local appliance or remote, such as cloud storage. In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified backup device (e.g., based on the value of the backup_device_identifier field). In another implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified source device (e.g., based on the value of the source_device_identifier field) and/or a specified user (e.g., based on the value of the user_identifier field), and the backup device associated with the source device and/or the user may be determined. 
     Recovery device configuration may be determined at  2509 . For example, the recovery device configuration may identify software and/or configuration data (e.g., operating system, file system, application software, user data) to be restored to a data storage volume of the recovery device (e.g., corresponding to the source device configuration of the source device). In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified recovery device configuration (e.g., based on the value of the recovery_device_configuration field). In another implementation, the source device configuration of the source device may be retrieved from the backup device and used as the recovery device configuration. 
     Associated source-nonspecific locations may be determined at  2513 . In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine the associated source-nonspecific locations (e.g., based on the value of the source_nonspecific_locations field). For example, the associated source-nonspecific locations may be specified by the administrative user (e.g., via a GUI prompting for source-nonspecific locations to use). In another implementation, the associated source-nonspecific locations (e.g., specified for the source device, specified for a set of devices on a LAN) may be retrieved from the backup device. For example, the associated source-nonspecific locations may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT sourceNonspecificLocationIdentifier, 
               
               
                   
                 sourceNonspecificLocationDescription, 
               
               
                   
                     sourceNonspecificLocationNetworkLocation 
               
               
                   
                 FROM SN_Configuration 
               
               
                   
                 WHERE sourceNonspecificLocationAssociatedDevices IN 
               
               
                   
                 (ID_source_device_1); 
               
               
                   
                   
               
            
           
         
       
     
     Data blocks may be prefetched from source-nonspecific locations at  2517 . In one embodiment, software and/or configuration data identified in the recovery device configuration that is available in equivalent form from the associated source-nonspecific locations may be retrieved. In one implementation, such software and/or configuration data may be obtained via a source-nonspecific data retrieve request. 
     A determination may be made at  2521  whether there remain more data blocks to fetch to complete the restore operation. If there remain more data blocks to fetch, the next data block may be selected at  2525 . 
     A determination may be made at  2529  whether the selected data block (e.g., a file) is a source-nonspecific data block. If the selected data block is not a source-nonspecific data block (e.g., the selected data block is user data not available from a source-nonspecific location), the selected data block may be fetched from the backup device at  2533 . In one implementation, the selected data block may be obtained via a backup data retrieve request. In some implementations, the selected data block may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the selected data block may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     If the selected data block is a source-nonspecific data block (e.g., the selected data block was prefetched from a source-nonspecific location, the selected data block is available for fetching from a source-nonspecific location), a source-nonspecific discrepancy hash for the selected data block may be determined at  2537 . In one implementation, a source-nonspecific data retrieve response associated with the selected data block may be parsed (e.g., using PHP commands) to determine a precalculated discrepancy hash for the selected data block (e.g., based on the value of the corresponding data_block_hash field). It is to be understood that, in some implementations, source-nonspecific discrepancy hashes may be fetched independently of data blocks (e.g., prior to fetching data blocks). In another implementation, a source-nonspecific discrepancy hash for the selected data block may be calculated. For example, a hash functions such as MD5, SHA-1, and/or the like may be utilized to calculate a hash of the selected data block. 
     A backup device discrepancy hash for the selected data block may be determined at  2541 . In one implementation, a backup data retrieve response associated with the selected data block may be parsed (e.g., using PHP commands) to determine a discrepancy hash (e.g., precalculated at backup time or other convenient time, calculated by the backup device when sending the backup data retrieve response) for the selected data block (e.g., based on the value of the corresponding data_block_hash field). It is to be understood that, in some implementations, backup device discrepancy hashes may be fetched independently of data blocks (e.g., prior to fetching data blocks). 
     A determination may be made at  2545  whether the discrepancy hashes match (e.g., are equal). If the source-nonspecific discrepancy hash for the selected data block does not match the backup device discrepancy hash for the selected data block, then there are differences between the source-nonspecific data block and the corresponding source-specific data block. Accordingly, the selected data block may be fetched from the backup device as discussed with regard to  2533 . 
     If the source-nonspecific discrepancy hash for the selected data block matches the backup device discrepancy hash for the selected data block, then the source-nonspecific data block and the corresponding source-specific data block are equivalent. Accordingly, the selected data block may be fetched from the corresponding source-nonspecific location (e.g., that provides a lower transmission time penalty compared to fetching from the backup device). A determination may be made at  2549  whether the selected data block has already been fetched from the corresponding source-nonspecific location. In one implementation, data blocks may be prefetched (e.g., as discussed with regard to  2517 ). Thus, if the selected data block has already been fetched, it does not have to be fetched again. In another implementation, fetching may be performed as part of the merging process (e.g., while merging source-nonspecific data blocks and corresponding source-specific data blocks). Thus, if the selected data block has not been fetched yet, it may be fetched from the corresponding source-nonspecific location at  2553 . In one implementation, the selected data block may be obtained via a source-nonspecific data retrieve request. In some implementations, the selected data block may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the selected data block may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     In an alternative embodiment, the merging process may be performed using a string editing procedure. For instance, first copy the source-nonspecific data blocks to the recovery computing device. Then, perform edits (e.g., deletions, insertions, replacements) of those blocks to transform that string of blocks to be the equivalent of the string of blocks in the backup disk image. Dynamic programming techniques, such as the Levenshtein distance or a weighted Levenshtein distance, may be employed to achieve a minimum number of edits. 
     Once there do not remain more data blocks to fetch to complete the restore operation, the recovery device may be operated at  2557 . For example, an operating system of the recovery device may be booted. 
       FIG. 26  shows implementation case(s) for the MBR. In  FIG. 26 , an exemplary implementation case of having a virtual machine operate as a recovery device is illustrated. A hypervisor or virtual machine monitor (VMM) creates and runs virtual machines. A computer on which a hypervisor runs one or more virtual machines is called a host machine (e.g., host hardware  2601 ), and each virtual machine is called a guest machine (e.g., guest VM  2620 , guest VM  2630 ). 
     Nested virtualization refers to virtualization that runs inside an already virtualized environment. With nested virtualization, a hypervisor is nested within a hypervisor. The host hypervisor  2610  running the main guest virtual machine  2630  is considered a level 0, or L0 hypervisor, and the main guest hypervisor  2640  running inside the main virtual machine is referred to as a level 1 or L1 hypervisor. Further nested virtualization would result in a level 2 (L2) hypervisor inside the nested VM, and so forth. An example of a host hypervisor (L0) running two guest VMs is shown. On the left, an L1 hypervisor that is running in the guest VM is running a nested guest VM  2650 . 
     In one embodiment, a recovery device for a backup may be a VM in the cloud. For example, an image of a source machine may be backed up in a Datto cloud (e.g., a backup device) and a user may want to run that image as a VM in another cloud (e.g., Amazon EC2). However, simply copying the entire image from the backup device could take a long time (e.g., especially in cases where the image is large, such as 10 TB). 
     In environments where direct control of the cloud and hypervisor is not available (e.g., to the business continuity and disaster recovery provider), a specialized recovery environment that enables efficient building of the recovery VM as a guest VM may be utilized to implement the low RTO recovery techniques described with regard to  FIGS. 18-25 . 
       FIG. 27  shows implementation case(s) for the MBR. In  FIG. 27 , an exemplary restore process to facilitate building a recovery VM is illustrated. A request to build a recovery VM using a backup disk image of a source computing device may be received. The source computing device may be a server, a workstation, a laptop, a mainframe computer, a virtual desktop, and/or the like. The source computing device may include a logical volume such as a hard disk drive (HDD), virtual hard disk (VHD), Solid State Drive (SSD), and/or the like. The backup disk image of the logical volume may be stored on a backup computing device. The backup computing device may be a local appliance or remote, such as cloud storage. During backup, data blocks of the logical volume may be sent to the backup device or may be fetched by the backup device. Various backup scheduling and/or protocols may be used (e.g., as described in the instant application). In various implementations, backups may be full, incremental, differential, and/or the like. In various implementations, backup data may be acquired via a variety of timing scenarios, such as on a fixed schedule, periods of low transmission activity, continuous data protection (CDP), and/or the like. 
     A host hypervisor running on host hardware may not have the capability to efficiently build the recovery VM. Accordingly, a guest VM may be booted from the host hypervisor. In one implementation, the guest VM may be a thin VM whose role is substantially restricted to running a guest hypervisor. The guest thin VM may run a guest hypervisor that has specialized functions over a conventional hypervisor (e.g., the guest hypervisor may have the intelligence to coordinate the building and booting of a nested guest abridged VM and live migrating a nested guest complete VM to a non-nested guest VM). The guest hypervisor may also be referred to as a shim environment or VM recovery environment. For example, the guest hypervisor may be a prioritizing hypervisor (e.g., as described with regard to  FIGS. 18-21 ), a source-nonspecific hypervisor (e.g., as described with regard to  FIGS. 22-25 ), and/or the like. 
     The guest hypervisor may initiate recovery of the source computing device as a nested guest abridged VM by creating a VM that includes data blocks sufficient to boot and provide partial functionality to a user. The shim environment may obtain data blocks sufficient to boot the nested guest abridged VM, which is abridged over the desired fully functional complete VM. This nested guest abridged VM may include the OS, application software that is likely to be immediately needed and associated data for the application software. The OS and software may be pulled from blocks on the backup disk image file or other sources, such as data storage containing standard/similar operating system and critical file data blocks. Examples of other sources include a standard or preconfigured version of the OS and software that may reside on the cloud, the guest VM, a different guest VM, a different computing device, installation disks, and/or the like. In some implementations, instead of fetching data blocks, the shim environment may write data into the recovery image based on certain information. For example, if a data block containing all zeroes is requested, the shim environment may write zeroes into the recovery image instead of fetching the data block. After writing these sufficient data blocks into the recovery disk image, the guest hypervisor may boot and operate the nested guest abridged VM. 
     The guest hypervisor may continue to build the nested guest abridged VM from data blocks of the backup disk image file, other sources, and/or the like, as the nested guest abridged VM operates, on a priority basis and/or on an as-needed basis until the nested guest abridged VM is substantially a nested guest complete VM. In some implementations, data blocks may be fetched in batches (e.g., to fetch data blocks belonging to the same software execution code, the same data set, a data set associated with fetched software data blocks, data blocks for a given user, and/or the like). At the time of booting and initial functioning, the nested guest abridged VM does not know that it is not complete (e.g., that it does not have its full image yet). Enabling operation with the nested guest abridged VM enables a fast startup. 
     The guest hypervisor may live migrate the nested guest complete VM to a non-nested guest VM state on the host hypervisor (e.g., or on a hypervisor with a lower level, such as from L1 to L0 or from L2 to L1). 
       FIG. 28  shows implementation case(s) for the MBR. In  FIG. 28 , an exemplary restore process to facilitate building a recovery VM is illustrated. A request to build a recovery VM using a backup disk image of a source computing device may be received. The source computing device may be a server, a workstation, a laptop, a mainframe computer, a virtual desktop, and/or the like. The source computing device may include a logical volume such as a hard disk drive (HDD), virtual hard disk (VHD), Solid State Drive (SSD), and/or the like. The backup disk image of the logical volume may be stored on a backup computing device. The backup computing device may be a local appliance or remote, such as cloud storage. During backup, data blocks of the logical volume may be sent to the backup device or may be fetched by the backup device. Various backup scheduling and/or protocols may be used (e.g., as described in the instant application). In various implementations, backups may be full, incremental, differential, and/or the like. In various implementations, backup data may be acquired via a variety of timing scenarios, such as on a fixed schedule, periods of low transmission activity, continuous data protection (CDP), and/or the like. 
     A host hypervisor running on host hardware may not have the capability to efficiently build the recovery VM. Accordingly, a reestablishing VM may be booted from the host hypervisor. The reestablishing VM may provide some operability for a user while building a latent VM within itself that will boot to replace the reestablishing VM. For example, the prioritizing techniques (e.g., as described with regard to  FIGS. 18-21 ), source-nonspecific techniques (e.g., as described with regard to  FIGS. 22-25 ), and/or the like may be used. The reestablishing VM may also be referred to as a shim or VM recovery environment. 
     The reestablishing VM may seek out data blocks sufficient for initial operation as a usable pseudo abridged VM of the backup disk image. These data blocks (e.g., OS and software) may be pulled from blocks on the backup disk image file or other sources, such as data storage containing standard/similar operating system and critical file data blocks. Examples of other sources include a standard or preconfigured version of the OS and software that may reside on the cloud, a VM, a different computing device, installation disks, and/or the like. In some implementations, instead of fetching data blocks, the shim may write data based on certain information. The reestablishing VM may be considered a pseudo abridged VM because it may not be an exact abridged version of the backup disk image, but may instead be running an OS and applications from various sources with somewhat different configurations. During operation, the reestablishing VM may use a fetch-as-needed approach to fetch data blocks to continue performing desired operations for the user. 
     The reestablishing VM may also build the latent VM from data blocks of the backup disk image file, other sources, and/or the like, as the reestablishing VM operates, on a priority basis and/or on an as-needed basis until the latent VM is substantially a copy of the backup disk image. In some implementations, data blocks may be fetched in batches (e.g., to fetch data blocks belonging to the same software execution code, the same data set, a data set associated with fetched software data blocks, data blocks for a given user, and/or the like). The boot blocks of the backup disk image are copied onto the boot blocks of the reestablishing VM, and, once the latent VM is built, the reestablishing VM is rebooted to boot the latent VM as an operable guest VM version of the backup disk image. 
       FIG. 29  shows a datagraph illustrating data flow(s) for the MBR. In  FIG. 29 , a client  2902  (e.g., of an administrative user) may send a restore request  2921  to a hypervisor  2906  to facilitate restoring data to a recovery virtual machine running on the hypervisor (e.g., the recovery VM may be running on the same host hardware as the source device associated with backed up data or on different host hardware). For example, the client may be a desktop, a laptop, a tablet, a smartphone, a smartwatch, and/or the like that is executing a client application. It is to be understood that, in some implementations, the client and the hypervisor (VM recovery environment) may be the same device. In an alternative embodiment, the restore request may be sent by a recovery software agent based on a trigger (e.g., upon detecting that the source device is corrupted, crashed, is unreachable via network, etc.). In one implementation, the restore request may include data such as a request identifier, a backup device identifier, a source device identifier, a recovery point identifier (e.g., a snapshot identifier), a user identifier, a recovery VM configuration, source-nonspecific locations data, and/or the like. In one embodiment, the client may provide the following example restore request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /restore_request.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;restore_request&gt; 
               
               
                   &lt;request_identifier&gt;ID_request_41&lt;/request_identifier&gt; 
               
               
                   &lt;backup_device_identifier&gt;ID_backup_device_1&lt;/ 
               
               
                   backup_device_identifier&gt; 
               
               
                   &lt;source_device_identifier&gt;ID_source_device_1&lt;/ 
               
               
                   source_device_identifier&gt; 
               
               
                   &lt;snapshot_identifier&gt;name or timestamp of snapshot&lt;/ 
               
               
                   snapshot_identifier&gt; 
               
               
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   &lt;recovery_device_configuration&gt; 
               
               
                     &lt;operating_system&gt; 
               
               
                       &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                       &lt;data_description&gt;Windows 10, version 1809&lt;/ 
               
               
                       data_description&gt; 
               
               
                     &lt;/operating_system&gt; 
               
               
                     &lt;application_software&gt; 
               
               
                       &lt;data_identifier&gt;ID_MicrosoftWord&lt;/data_identifier&gt; 
               
               
                       &lt;data_description&gt;Microsoft Word, version 2016&lt;/ 
               
               
                       data_description&gt; 
               
               
                     &lt;/application_software&gt; 
               
               
                     ... 
               
               
                   &lt;/recovery_device_configuration&gt; 
               
               
                   &lt;source_nonspecific_locations&gt; 
               
               
                     &lt;sn_location&gt; 
               
               
                       &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                       &lt;location&gt;\\Windows10_Install_Disks&lt;/location&gt; 
               
               
                     &lt;/sn_location&gt; 
               
               
                     &lt;sn_location&gt; 
               
               
                       &lt;data_identifier&gt;ID_MicrosoftWord&lt;/data_identifier&gt; 
               
               
                       &lt;location&gt;D:\Word_Install_Disks&lt;/location&gt; 
               
               
                     &lt;/sn_location&gt; 
               
               
                     ... 
               
               
                   &lt;/source_nonspecific_locations&gt; 
               
               
                 &lt;/restore_request&gt; 
               
               
                   
               
            
           
         
       
     
     A virtual machine restore processing (VMRP) component  2925  may utilize data provided in the restore request to facilitate restoring data to the recovery VM. See  FIGS. 30 and 31  for additional details regarding the VMRP component. 
     The VM recovery environment may send a source-nonspecific data retrieve request  2929  to a source-nonspecific location  2914  to fetch data blocks from the source-nonspecific location to facilitate restoring the recovery VM. In one implementation, the source-nonspecific data retrieve request may include data such as a request identifier, a data identifier, a data description, and/or the like. In one embodiment, the VN1 recovery environment may provide the following example source-nonspecific data retrieve request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /source_nonspecific_data_retrieve_request.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;source_nonspecific_data_retrieve_request&gt; 
               
               
                   &lt;request_identifier&gt;ID_request_42&lt;/request_identifier&gt; 
               
               
                   &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                   &lt;data_description&gt;Windows 10, version 1809&lt;/data_description&gt; 
               
               
                 &lt;/source_nonspecific_data_retrieve_request&gt; 
               
               
                   
               
            
           
         
       
     
     The source-nonspecific location may send a source-nonspecific data retrieve response  2933  to the VM recovery environment with the requested data blocks. In one implementation, the source-nonspecific data retrieve response may include data such as a response identifier, the requested data, discrepancy hashes, and/or the like. In one embodiment, the source-nonspecific location may provide the following example source-nonspecific data retrieve response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /source_nonspecific_data_retrieve_response.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;source_nonspecific_data_retrieve_response&gt; 
               
               
                   &lt;response_identifier&gt;ID_response_42&lt;/response_identifier&gt; 
               
               
                   &lt;requested_data&gt;Windows 10, version 1809 install files&lt;/ 
               
               
                   requested_data&gt; 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                     &lt;discrepancy_hash&gt; 
               
               
                       &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                       &lt;data_block_identifier&gt;file1.exe&lt;/data_block_identifier&gt; 
               
               
                       &lt;data_block_hash&gt;hash of file1.exe&lt;/data_block_hash&gt; 
               
               
                     &lt;/discrepancy_hash&gt; 
               
               
                     &lt;discrepancy_hash&gt; 
               
               
                       &lt;data_identifier&gt;ID_Windows10&lt;/data_identifier&gt; 
               
               
                       &lt;data_block_identifier&gt;file3.exe&lt;/data_block_identifier&gt; 
               
               
                       &lt;data_block_hash&gt;hash of file3.exe&lt;/data_block_hash&gt; 
               
               
                     &lt;/discrepancy_hash&gt; 
               
               
                     ... 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                 &lt;/source_nonspecific_data_retrieve_response&gt; 
               
               
                   
               
            
           
         
       
     
     The VM recovery environment may send a backup data retrieve request  2937  to a backup device  2910  to facilitate restoring backup data. In one implementation, the backup data retrieve request may include data such as a request identifier, a recovery VM identifier, a source device identifier, a recovery point identifier (e.g., a snapshot identifier), a user identifier, requested data blocks, and/or the like. In one embodiment, the VM recovery environment may provide the following example backup data retrieve request, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 POST /backup_data_retrieve_request.php HTTP/1.1 
               
               
                   
                 Host: www.server.com 
               
               
                   
                 Content-Type: Application/XML 
               
               
                   
                 Content-Length: 667 
               
               
                   
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                   
                 &lt;backup_data_retrieve_request&gt; 
               
               
                   
                   &lt;request_identifier&gt;ID_request_43&lt;/request_identifier&gt; 
               
               
                   
                   &lt;recovery_device_identifier&gt;ID_recovery_VM_1&lt;/ 
               
               
                   
                   recovery_device_identifier&gt; 
               
               
                   
                   &lt;source_device_identifier&gt;ID_source_device_1&lt;/ 
               
               
                   
                   source_device_identifier&gt; 
               
               
                   
                   &lt;snapshot_identifier&gt;name or timestamp of snapshot&lt;/ 
               
               
                   
                   snapshot_identifier&gt; 
               
               
                   
                   &lt;user_identifier&gt;ID_user_1&lt;/user_identifier&gt; 
               
               
                   
                   &lt;requested_data_blocks&gt;data blocks to retrieve&lt;/ 
               
               
                   
                   requested_data_blocks&gt; 
               
               
                   
                 &lt;/backup_data_retrieve_request&gt; 
               
               
                   
                   
               
            
           
         
       
     
     The backup device may send a backup data retrieve response  2941  to the VM recovery environment with the requested data blocks. In one implementation, the backup data retrieve response may include data such as a response identifier, the requested data blocks, discrepancy hashes, and/or the like. In one embodiment, the backup device may provide the following example backup data retrieve response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /backup_data_retrieve_response.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;backup_data_retrieve_response&gt; 
               
               
                   &lt;response_identifier&gt;ID_response_43&lt;/response_identifier&gt; 
               
               
                   &lt;requested_data_blocks&gt;retrieved data blocks&lt;/ 
               
               
                   requested_data_blocks&gt; 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                     &lt;discrepancy_hash&gt; 
               
               
                       &lt;data_block_identifier&gt;user_file4.docx&lt;/ 
               
               
                       data_block_identifier&gt; 
               
               
                       &lt;data_block_hash&gt;hash of user_file4.docx&lt;/ 
               
               
                       data_block_hash&gt; 
               
               
                     &lt;/discrepancy_hash&gt; 
               
               
                     &lt;discrepancy_hash&gt; 
               
               
                       &lt;data_block_identifier&gt;user_file5.docx&lt;/ 
               
               
                       data_block_identifier&gt; 
               
               
                       &lt;data_block_hash&gt;hash of user_file5.docx&lt;/ 
               
               
                       data_block_hash&gt; 
               
               
                     &lt;/discrepancy_hash&gt; 
               
               
                     ... 
               
               
                   &lt;discrepancy_hashes&gt; 
               
               
                 &lt;/backup_data_retrieve_response&gt; 
               
               
                   
               
            
           
         
       
     
     The VM recovery environment may send a restore response  2945  to the client to inform the user whether the restore request was processed successfully and/or to request corrections. In one implementation, the restore response may include data such as a response identifier, a status, and/or the like. In one embodiment, the VM recovery environment may provide the following example restore response, substantially in the form of a HTTP(S) POST message including XML-formatted data, as provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 POST /restore_response.php HTTP/1.1 
               
               
                 Host: www.server.com 
               
               
                 Content-Type: Application/XML 
               
               
                 Content-Length: 667 
               
               
                 &lt;?XML version = “1.0” encoding = “UTF-8”?&gt; 
               
               
                 &lt;restore_response&gt; 
               
               
                   &lt;response_identifier&gt;ID_response_41&lt;/response_identifier&gt; 
               
               
                   &lt;status&gt;OK&lt;/status&gt; 
               
               
                 &lt;/restore_response&gt; 
               
               
                   
               
            
           
         
       
     
       FIG. 30  shows a logic flow illustrating embodiments of a virtual machine restore processing (VMRP) component for the MBR. In  FIG. 30 , a restore request may be obtained by a recovery device (e.g., host hardware running a host hypervisor) at  3001 . For example, the restore request may be obtained as a result of an administrative user utilizing a MBR application, mobile app, website, and/or the like to facilitate restoring data to a recovery VM. In another example, the restore request may be obtained from a recovery software agent as a result of a triggered event (e.g., upon detecting that a source device is corrupted, crashed, is unreachable via network, etc.). 
     A virtual machine recovery environment may be booted at  3005 . In one implementation, a guest VM may be booted from the host hypervisor. For example, the guest VM may be a thin VM whose role is substantially restricted to running a guest hypervisor. The guest thin VM may run a guest hypervisor that has specialized functions over a conventional hypervisor (e.g., the guest hypervisor may have the intelligence to coordinate the building and booting of a nested guest abridged VM and live migrating a nested guest complete VM to a non-nested guest VM). In some implementations, the guest VA/I and the guest hypervisor may be one entity, and may be referred to collectively as the VM recovery environment. 
     A paired backup device may be determined at  3009 . For example, the backup device may be a local appliance or remote, such as cloud storage. In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified backup device (e.g., based on the value of the backup_device_identifier field). In another implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified source device (e.g., based on the value of the source_device_identifier field) and/or a specified user (e.g., based on the value of the user_identifier field), and the backup device associated with the source device and/or the user may be determined. 
     Recovery VM configuration may be determined at  3013 . For example, the recovery VM configuration may identify software and/or configuration data (e.g., operating system, file system, application software, user data) to be restored to a data storage volume of the recovery VM (e.g., corresponding to the source device configuration of the source device). In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified recovery VM configuration (e.g., based on the value of the recovery_device_configuration field). In another implementation, the source device configuration of the source device may be retrieved from the backup device and used as the recovery VM configuration. 
     Associated source-nonspecific locations may be determined at  3017 . In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine the associated source-nonspecific locations (e.g., based on the value of the source_nonspecific_locations field). For example, the associated source-nonspecific locations may be specified by the administrative user (e.g., via a GUI prompting for source-nonspecific locations to use). In another implementation, the associated source-nonspecific locations (e.g., specified for the source device, specified for a set of recovery VMs in a cloud) may be retrieved from the backup device (e.g., or from another data repository). For example, the associated source-nonspecific locations may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT sourceNonspecificLocationIdentifier, 
               
               
                   
                 sourceNonspecificLocationDescription, 
               
               
                   
                     sourceNonspecificLocationNetworkLocation 
               
               
                   
                 FROM SN_Configuration 
               
               
                   
                 WHERE sourceNonspecificLocationAssociatedDevices IN 
               
               
                   
                 (ID_source_device_1); 
               
               
                   
                   
               
            
           
         
       
     
     A recovery prioritization index for the restore operation may be obtained at  3021 . In one implementation, the recovery prioritization index may be retrieved from the backup device. For example, the recovery prioritization index may be obtained via a MySQL database command similar to the following: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 SELECT * 
               
               
                 FROM RecoveryPriorities 
               
               
                 WHERE source_device_ID = ID_source_device_1 AND user_ID = 
               
               
                 ID_user_1; 
               
               
                   
               
            
           
         
       
     
     In one embodiment, essential data blocks may be determined. In one implementation, the recovery prioritization index may be analyzed to determine data blocks marked as essential. In another implementation, the recovery prioritization index may be analyzed to determine essential data blocks having a recovery priority ranking at or above a specified threshold (e.g., data blocks with recovery priority of 9 or above). In another implementation, operating system data blocks and/or other data blocks sufficient to boot and provide partial functionality to the user may be considered essential. 
     Essential data blocks may be prefetched from the associated source-nonspecific locations at  3025 . In one embodiment, software and/or configuration data identified in the recovery VM configuration that is determined to be essential and that is available in equivalent form from the associated source-nonspecific locations (e.g., that provide a lower transmission time penalty compared to fetching from the backup device) may be retrieved. In one implementation, such software and/or configuration data may be obtained via a source-nonspecific data retrieve request. 
     Essential data blocks may be prefetched from the backup device at  3029 . In one embodiment, data blocks that are determined to be essential and that are not available in equivalent form from the associated source-nonspecific locations may be retrieved. In one implementation, such essential data blocks may be obtained via a backup data retrieve request. 
     An operating system of the nested guest abridged VM (the recovery VM) may be booted on the VM recovery environment at  3033 . In one embodiment, the recovery VM may be considered abridged because the recovery VM can operate after the essential data blocks are fetched, but before all data blocks are fetched. Operating the abridged recovery VM allows the recovery time objective (RTO) to be reduced, allowing the user to utilize the recovery VM faster. In one implementation, the VM recovery environment may process requests from the nested guest abridged VM to access data blocks that have not yet been fetched. 
     A determination may be made at  3037  whether there remain more data blocks to fetch to complete the restore operation. If so, a determination may be made at  3041  whether a command was received by the nested guest abridged VM (e.g., from the user). If a command was received, a determination may be made at  3045  whether command data blocks associated with the command have already been fetched. If the command data blocks have not yet been fetched, the command data blocks may be fetched from the backup device at  3049 . In one implementation, the command data blocks may be obtained via a backup data retrieve request. In some implementations, the command data blocks may be fetched in batches that may be associated with an application or a data set. In some implementations, the command data blocks may be fetched in batches that improve the efficiency of reading and/or transmitting data blocks. The command data blocks may be utilized by the nested guest abridged VM to execute the command at  3053 . 
     If a command was not received or if the command data blocks have already been fetched, a data block with the next highest recovery priority may be determined at  3057 . In one implementation, the recovery prioritization index may be analyzed to determine a remaining data block having the next highest recovery priority ranking. 
     A determination may be made at  3061  whether the data block with the next highest recovery priority (e.g., a file) is a source-nonspecific data block. If the data block with the next highest recovery priority is not a source-nonspecific data block (e.g., the data block with the next highest recovery priority is user data not available from a source-nonspecific location), the data block with the next highest recovery priority may be fetched from the backup device at  3065 . In one implementation, the data block with the next highest recovery priority may be obtained via a backup data retrieve request. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     If the data block with the next highest recovery priority is a source-nonspecific data block (e.g., the data block with the next highest recovery priority was prefetched from a source-nonspecific location, the data block with the next highest recovery priority is available for fetching from a source-nonspecific location), a source-nonspecific discrepancy hash for the data block with the next highest recovery priority may be determined at  3069 . In one implementation, a source-nonspecific data retrieve response associated with the data block with the next highest recovery priority may be parsed (e.g., using PHP commands) to determine a precalculated discrepancy hash for the data block with the next highest recovery priority (e.g., based on the value of the corresponding data_block_hash field). It is to be understood that, in some implementations, source-nonspecific discrepancy hashes may be fetched independently of data blocks (e.g., prior to fetching data blocks). In another implementation, a source-nonspecific discrepancy hash for the data block with the next highest recovery priority may be calculated. For example, a hash functions such as MD5, SHA-1, and/or the like may be utilized to calculate a hash of the data block with the next highest recovery priority. 
     A backup device discrepancy hash for the data block with the next highest recovery priority may be determined at  3073 . In one implementation, a backup data retrieve response associated with the data block with the next highest recovery priority may be parsed (e.g., using PHP commands) to determine a discrepancy hash (e.g., precalculated at backup time or other convenient time, calculated by the backup device when sending the backup data retrieve response) for the data block with the next highest recovery priority (e.g., based on the value of the corresponding data_block_hash field). It is to be understood that, in some implementations, backup device discrepancy hashes may be fetched independently of data blocks (e.g., prior to fetching data blocks). 
     A determination may be made at  3077  whether the discrepancy hashes match (e.g., are equal). If the source-nonspecific discrepancy hash for the data block with the next highest recovery priority does not match the backup device discrepancy hash for the data block with the next highest recovery priority, then there are differences between the source-nonspecific data block and the corresponding source-specific data block. Accordingly, the data block with the next highest recovery priority may be fetched from the backup device at  3081 . In one implementation, the data block with the next highest recovery priority may be obtained via a backup data retrieve request. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     If the source-nonspecific discrepancy hash for the data block with the next highest recovery priority matches the backup device discrepancy hash for the data block with the next highest recovery priority, then the source-nonspecific data block and the corresponding source-specific data block are equivalent. Accordingly, the data block with the next highest recovery priority may be fetched from the corresponding source-nonspecific location (e.g., that provides a lower transmission time penalty compared to fetching from the backup device). A determination may be made at  3085  whether the data block with the next highest recovery priority has already been fetched from the corresponding source-nonspecific location. If the data block with the next highest recovery priority has already been fetched (e.g., essential data blocks may be prefetched), it does not have to be fetched again. If the data block with the next highest recovery priority has not been fetched yet (e.g., the data block with the next highest recovery priority was not prefetched), it may be fetched from the corresponding source-nonspecific location at  3089 . In one implementation, the data block with the next highest recovery priority may be obtained via a source-nonspecific data retrieve request. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     The VM recovery environment may continue to build the nested guest abridged VM from data blocks fetched from the backup device and/or fetched from source-nonspecific locations, as the nested guest abridged VM operates, on a priority basis and/or on an as-needed basis until the nested guest abridged VM is substantially a nested guest complete VM. The VM recovery environment may live migrate the nested guest complete VM to a non-nested guest VM (e.g., on the host hypervisor) at  3093 . 
       FIG. 31  shows a logic flow illustrating embodiments of a virtual machine restore processing (VMRP) component for the MBR. In  FIG. 31 , a restore request may be obtained by a recovery device (e.g., host hardware running a host hypervisor) at  3101 . For example, the restore request may be obtained as a result of an administrative user utilizing a MBR application, mobile app, website, and/or the like to facilitate restoring data to a recovery VM. In another example, the restore request may be obtained from a recovery software agent as a result of a triggered event (e.g., upon detecting that a source device is corrupted, crashed, is unreachable via network, etc.). 
     A reestablishing virtual machine may be booted at  3105 . In one implementation, the reestablishing VM may be booted from the host hypervisor. The reestablishing VM may provide some operability for a user while building a latent VM within itself that will boot to replace the reestablishing VM. The reestablishing VM may also be referred to as a VM recovery environment. 
     A paired backup device may be determined at  3109 . For example, the backup device may be a local appliance or remote, such as cloud storage. In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified backup device (e.g., based on the value of the backup_device_identifier field). In another implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified source device (e.g., based on the value of the source_device_identifier field) and/or a specified user (e.g., based on the value of the user_identifier field), and the backup device associated with the source device and/or the user may be determined. 
     Recovery VM configuration may be determined at  3113 . For example, the recovery VM configuration may identify software and/or configuration data (e.g., operating system, file system, application software, user data) to be restored to a data storage volume of the recovery VM (e.g., corresponding to the source device configuration of the source device). In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine a specified recovery VM configuration (e.g., based on the value of the recovery_device_configuration field). In another implementation, the source device configuration of the source device may be retrieved from the backup device and used as the recovery VM configuration. 
     Associated source-nonspecific locations may be determined at  3117 . In one implementation, the restore request may be parsed (e.g., using PHP commands) to determine the associated source-nonspecific locations (e.g., based on the value of the source_nonspecific_locations field). For example, the associated source-nonspecific locations may be specified by the administrative user (e.g., via a GUI prompting for source-nonspecific locations to use). In another implementation, the associated source-nonspecific locations (e.g., specified for the source device, specified for a set of recovery VMs in a cloud) may be retrieved from the backup device (e.g., or from another data repository). For example, the associated source-nonspecific locations may be determined via a MySQL database command similar to the following: 
     
       
         
           
               
               
             
               
                   
                   
               
             
            
               
                   
                 SELECT sourceNonspecificLocationIdentifier, 
               
               
                   
                 sourceNonspecificLocationDescription, 
               
               
                   
                     sourceNonspecificLocationNetworkLocation 
               
               
                   
                 FROM SN_Configuration 
               
               
                   
                 WHERE sourceNonspecificLocationAssociatedDevices IN 
               
               
                   
                 (ID_source_device_1); 
               
               
                   
                   
               
            
           
         
       
     
     A recovery prioritization index for the restore operation may be obtained at  3121 . In one implementation, the recovery prioritization index may be retrieved from the backup device. For example, the recovery prioritization index may be obtained via a MySQL database command similar to the following: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 SELECT * 
               
               
                 FROM RecoveryPriorities 
               
               
                 WHERE source_device_ID = ID_source_device_1 AND user_ID = 
               
               
                 ID_user_1; 
               
               
                   
               
            
           
         
       
     
     In one embodiment, essential data blocks may be determined. In one implementation, the recovery prioritization index may be analyzed to determine data blocks marked as essential. In another implementation, the recovery prioritization index may be analyzed to determine essential data blocks having a recovery priority ranking at or above a specified threshold (e.g., data blocks with recovery priority of 9 or above). In another implementation, operating system data blocks and/or other data blocks sufficient for initial operation as a usable pseudo abridged VM of the backup disk image of the source device may be considered essential. 
     Essential data blocks may be prefetched from the associated source-nonspecific locations at  3125 . In one embodiment, software and/or configuration data identified in the recovery VM configuration that is determined to be essential and that is available in equivalent form from the associated source-nonspecific locations (e.g., that provide a lower transmission time penalty compared to fetching from the backup device) may be retrieved. In one implementation, such software and/or configuration data may be obtained via a source-nonspecific data retrieve request. 
     Essential data blocks may be prefetched from the backup device at  3129 . In one embodiment, data blocks that are determined to be essential and that are not available in equivalent form from the associated source-nonspecific locations may be retrieved. In one implementation, such essential data blocks may be obtained via a backup data retrieve request. 
     The user may be provided with access to the reestablishing VM at  3131 . In one embodiment, the reestablishing VM may be considered a pseudo abridged VM because it may not be an exact abridged version of the backup disk image of the source device, but may instead be running an OS and applications from various sources with somewhat different configurations. Operating the abridged recovery VM allows the recovery time objective (RTO) to be reduced, allowing the user to utilize the recovery VM faster. 
     The reestablishing VM may create a latent VM at  3133 . In one implementation, the reestablishing VM may use the prefetched essential data blocks obtained from the associated source-nonspecific locations and/or from the backup device to create the latent VM within the reestablishing VM. 
     A determination may be made at  3137  whether there remain more data blocks to fetch to complete the restore operation. For example, data blocks may be fetched until the latent VM is substantially a copy of the backup disk image of the source device. If there remain more data blocks to fetch, a determination may be made at  3141  whether a command was received by the reestablishing VM (e.g., from the user). If a command was received, a determination may be made at  3145  whether command data blocks associated with the command have already been fetched. If the command data blocks have not yet been fetched, the command data blocks may be fetched from the backup device for both the reestablishing VM and the latent VM at  3149 . In one implementation, the command data blocks may be obtained via a backup data retrieve request. In some implementations, the command data blocks may be fetched in batches that may be associated with an application or a data set. In some implementations, the command data blocks may be fetched in batches that improve the efficiency of reading and/or transmitting data blocks. The command data blocks may be utilized by the reestablishing VM to execute the command at  3153 . 
     If a command was not received or if the command data blocks have already been fetched, a data block with the next highest recovery priority may be determined at  3157 . In one implementation, the recovery prioritization index may be analyzed to determine a remaining data block having the next highest recovery priority ranking. 
     A determination may be made at  3161  whether the data block with the next highest recovery priority (e.g., a file) is a source-nonspecific data block. If the data block with the next highest recovery priority is not a source-nonspecific data block (e.g., the data block with the next highest recovery priority is user data not available from a source-nonspecific location), the data block with the next highest recovery priority may be fetched from the backup device for the latent VM at  3165 . In one implementation, the data block with the next highest recovery priority may be obtained via a backup data retrieve request. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     If the data block with the next highest recovery priority is a source-nonspecific data block (e.g., the data block with the next highest recovery priority was prefetched from a source-nonspecific location, the data block with the next highest recovery priority is available for fetching from a source-nonspecific location), a source-nonspecific discrepancy hash for the data block with the next highest recovery priority may be determined at  3169 . In one implementation, a source-nonspecific data retrieve response associated with the data block with the next highest recovery priority may be parsed (e.g., using PHP commands) to determine a precalculated discrepancy hash for the data block with the next highest recovery priority (e.g., based on the value of the corresponding data_block_hash field). It is to be understood that, in some implementations, source-nonspecific discrepancy hashes may be fetched independently of data blocks (e.g., prior to fetching data blocks). In another implementation, a source-nonspecific discrepancy hash for the data block with the next highest recovery priority may be calculated. For example, a hash functions such as MD5, SHA-1, and/or the like may be utilized to calculate a hash of the data block with the next highest recovery priority. 
     A backup device discrepancy hash for the data block with the next highest recovery priority may be determined at  3173 . In one implementation, a backup data retrieve response associated with the data block with the next highest recovery priority may be parsed (e.g., using PHP commands) to determine a discrepancy hash (e.g., precalculated at backup time or other convenient time, calculated by the backup device when sending the backup data retrieve response) for the data block with the next highest recovery priority (e.g., based on the value of the corresponding data_block_hash field). It is to be understood that, in some implementations, backup device discrepancy hashes may be fetched independently of data blocks (e.g., prior to fetching data blocks). 
     A determination may be made at  3177  whether the discrepancy hashes match (e.g., are equal). If the source-nonspecific discrepancy hash for the data block with the next highest recovery priority does not match the backup device discrepancy hash for the data block with the next highest recovery priority, then there are differences between the source-nonspecific data block and the corresponding source-specific data block. Accordingly, the data block with the next highest recovery priority may be fetched from the backup device for the latent VM at  3181 . In one implementation, the data block with the next highest recovery priority may be obtained via a backup data retrieve request. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     If the source-nonspecific discrepancy hash for the data block with the next highest recovery priority matches the backup device discrepancy hash for the data block with the next highest recovery priority, then the source-nonspecific data block and the corresponding source-specific data block are equivalent. Accordingly, the data block with the next highest recovery priority may be fetched from the corresponding source-nonspecific location (e.g., that provides a lower transmission time penalty compared to fetching from the backup device). A determination may be made at  3185  whether the data block with the next highest recovery priority has already been fetched from the corresponding source-nonspecific location. If the data block with the next highest recovery priority has already been fetched (e.g., essential data blocks may be prefetched), it does not have to be fetched again. If the data block with the next highest recovery priority has not been fetched yet (e.g., the data block with the next highest recovery priority was not prefetched), it may be fetched from the corresponding source-nonspecific location for the latent VM at  3189 . In one implementation, the data block with the next highest recovery priority may be obtained via a source-nonspecific data retrieve request. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks associated with a corresponding application or data set. In some implementations, the data block with the next highest recovery priority may be fetched in a batch with other data blocks that improves the efficiency of reading and/or transmitting data blocks. 
     The reestablishing VM may continue to build the latent VM from data blocks fetched from the backup device and/or fetched from source-nonspecific locations, as the reestablishing VM operates, on a priority basis and/or on an as-needed basis until the latent VM is substantially a copy of the backup disk image of the source device. The boot blocks of the backup disk image may be copied onto the boot blocks of the reestablishing VM, and, once the latent VM is built, the reestablishing VM may be rebooted at  3193  to boot the latent VM as an operable guest VM version of the backup disk image. 
     ADDITIONAL ALTERNATIVE EMBODIMENT EXAMPLES 
     The following alternative example embodiments provide a number of variations of some of the core principles already discussed for expanded color on the abilities of the MBR. 
     Alternative Embodiment 1 
     A system for replicating data snapshots from multiple (e.g., SaaS) clients at a source node to respective replication targets on a replication target node using a multiplexed data stream, comprising: 
     1. A multi-client (e.g., SaaS) protection module on the source node that contains the (e.g., SaaS) client snapshot data, where the (e.g., SaaS) client snapshot data is associated with respective (e.g., SaaS) client identifiers (e.g., customer IDs) 
     2. A cloud database that contains an index that maps the (e.g., SaaS) client identifiers to the respective replication targets 
     3. A notification module on the source node that notifies a queueing module that (e.g., SaaS) client snapshot data are available for replicating. The multi-client (e.g., SaaS) protection module on the source node uses the notification module after taking and performing a backup and creating a snapshot. 
     4. A queueing module responsive to a notification from the notification module, that forms a prioritized queue of the (e.g., SaaS) client snapshot data that should be replicated. 
     5. A sending module operating on the source node that acquires the queued-prioritized (e.g., SaaS) client snapshot data, establishes a TCP connection to a replication target node, forms a multiplexed, serialized data stream of prioritized SaaS client snapshot data, and sends the multiplexed, serialized data stream to the replication target node 
     6. A receiving module on the replication target node that receives the multiplexed, serialized data stream, demultiplexes and deserializes the data within the stream into individual streams according to the mapping in the database, and persists the (e.g., SaaS) client snapshot data to ZFS files at replication targets according to the mapping in the database. 
     Alternative Embodiment 2 
     As a data backup procedure, a SaaS protection module will take snapshots using a snapshot enabled file system. For example, a snapshot may be something that can be mounted and contains the backed up cloud data at a specific point-in-time. The snapshots are taken periodically. The snapshots should be replicated to a secondary node to create a second copy within the MBR cloud in order to provide a more secure backup. For every dataset (e.g., backup volume) we should replicate, we pipe zfs send into a named pipe (FIFO) and use Scala to read the send data from the named pipes and combine them into a single stream (single stream communication). That combined stream is sent over a single TCP/IP connection to the replication target. On the replication target, the stream is split back up. This approach enables stream multiplexing and using advanced compression techniques. Also, a customer can replicate to different targets on a replication node. If a node gets full, the stream can move to another node. Further, the target can replicate to another node, and can replicate back to a different primary node. 
     When the SaaS protection module creates a snapshot on the source node it will start communicating with a replication module, indicating that it took a snapshot and it should be replicated. A queueing module is within the replication module. The queueing module waits to be notified by the SaaS protection module that a new snapshot has been generated and should be replicated. The queueing module sorts the snapshots by various rules to build a queue of prioritized snapshots. An example of queue prioritization of snapshots is to give highest priority to the least recently replicated datasets. In addition to prioritization, if there are multiple snapshots in the queue that are from the same dataset, the queueing module can aggregate that snapshot data increasing the efficiency of the sending module. The queueing module has an orchestration function. It keeps track of everything that should be sent and performs aggregations and prioritizations. The module enqueues information in the snapshots that should be replicated. It puts information into the queue that the replication may utilize downstream, such as zfs data set name and snapshot name. 
     A send module sends the data to a replication target node. Software on the source node communicates with the queue and obtains the prioritized snapshots, i.e., it gets data that we want to replicate. It opens a TCP connection to the replication target node, which it looks up in the database mapping. So, it knows that a particular snapshot from a client/customer should be replicated to a replication target node and replication target based on the database lookup. The send module then streams the data to the replication target node. This may not be happening one-by-one (customer data is not sent strictly customer-by-customer serial). It may be popping multiple snapshots that should be replicated off the queue. The streaming is of multiple sources of data over to the replication target node. One client may be generating many snapshots per day. We may snapshot per user. If a client has 50 users in their organization, we may be generating 50 snapshots three times per day at the source node. If we should replicate these in parallel and if the snapshots that are being replicated in parallel have the same replication target node, then the send module multiplexes the snapshots and sends them over the same connection. If a snapshot for a dataset already exists on the replication node and a newer snapshot needs to be replicated for that same dataset, only the changes between the last replicated snapshot on the replication target and the newest snapshot are streamed. 
     The receiving module at the replication target node receives the replication data. It demultiplexes and de-serializes it, i.e., a data chunk is for a particular customer for a particular dataset. So, it appropriately writes the data chunks to zfs datasets that we are replicating. 
     If multiple replication nodes are specified, multiple queues and TCP data streams may be used. 
     MBR Controller 
       FIG. 32  shows a block diagram illustrating embodiments of a MBR controller. In this embodiment, the MBR controller  3201  may serve to aggregate, process, store, search, serve, identify, instruct, generate, match, and/or facilitate interactions with a computer through backup systems technologies, and/or other related data. 
     Users, which may be people and/or other systems, may engage information technology systems (e.g., computers) to facilitate information processing. In turn, computers employ processors to process information; such processors  3203  may be referred to as central processing units (CPU). One form of processor is referred to as a microprocessor. CPUs use communicative circuits to pass binary encoded signals acting as instructions to allow various operations. These instructions may be operational and/or data instructions containing and/or referencing other instructions and data in various processor accessible and operable areas of memory  3229  (e.g., registers, cache memory, random access memory, etc.). Such communicative instructions may be stored and/or transmitted in batches (e.g., batches of instructions) as programs and/or data components to facilitate desired operations. These stored instruction codes, e.g., programs, may engage the CPU circuit components and other motherboard and/or system components to perform desired operations. One type of program is a computer operating system, which, may be executed by CPU on a computer; the operating system enables and facilitates users to access and operate computer information technology and resources. Some resources that may be employed in information technology systems include: input and output mechanisms through which data may pass into and out of a computer; memory storage into which data may be saved; and processors by which information may be processed. These information technology systems may be used to collect data for later retrieval, analysis, and manipulation, which may be facilitated through a database program. These information technology systems provide interfaces that allow users to access and operate various system components. 
     In one embodiment, the MBR controller  3201  may be connected to and/or communicate with entities such as, but not limited to: one or more users from peripheral devices  3212  (e.g., user input devices  3211 ); an optional cryptographic processor device  3228 ; and/or a communications network  3213 . 
     Networks comprise the interconnection and interoperation of clients, servers, and intermediary nodes in a graph topology. It should be noted that the term “server” as used throughout this application refers generally to a computer, other device, program, or combination thereof that processes and responds to the requests of remote users across a communications network. Servers serve their information to requesting “clients.” The term “client” as used herein refers generally to a computer, program, other device, user and/or combination thereof that is capable of processing and making requests and obtaining and processing any responses from servers across a communications network. A computer, other device, program, or combination thereof that facilitates, processes information and requests, and/or furthers the passage of information from a source user to a destination user is referred to as a “node.” Networks are generally thought to facilitate the transfer of information from source points to destinations. A node specifically tasked with furthering the passage of information from a source to a destination is called a “router.” There are many forms of networks such as Local Area Networks (LANs), Pico networks, Wide Area Networks (WANs), Wireless Networks (WLANs), etc. For example, the Internet is, generally, an interconnection of a multitude of networks whereby remote clients and servers may access and interoperate with one another. 
     The MBR controller  3201  may be based on computer systems that may comprise, but are not limited to, components such as: a computer systemization  3202  connected to memory  3229 . 
     Computer Systemization 
     A computer systemization  3202  may comprise a clock  3230 , central processing unit (“CPU(s)” and/or “processor(s)” (these terms are used interchangeable throughout the disclosure unless noted to the contrary))  3203 , a memory  3229  (e.g., a read only memory (ROM)  3206 , a random access memory (RAM)  3205 , etc.), and/or an interface bus  3207 , and most frequently, although not necessarily, are all interconnected and/or communicating through a system bus  3204  on one or more (mother)board(s)  3202  having conductive and/or otherwise transportive circuit pathways through which instructions (e.g., binary encoded signals) may travel to effectuate communications, operations, storage, etc. The computer systemization may be connected to a power source  3286 ; e.g., optionally the power source may be internal. Optionally, a cryptographic processor  3226  may be connected to the system bus. In another embodiment, the cryptographic processor, transceivers (e.g., ICs)  3274 , and/or sensor array (e.g., accelerometer, altimeter, ambient light, barometer, global positioning system (GPS) (thereby allowing MBR controller to determine its location), gyroscope, magnetometer, pedometer, proximity, ultra-violet sensor, etc.)  3273  may be connected as either internal and/or external peripheral devices  3212  via the interface bus I/O  3208  (not pictured) and/or directly via the interface bus  3207 . In turn, the transceivers may be connected to antenna(s)  3275 , thereby effectuating wireless transmission and reception of various communication and/or sensor protocols; for example the antenna(s) may connect to various transceiver chipsets (depending on deployment needs), including: Broadcom® BCM4329FKUBG transceiver chip (e.g., providing 802.11n, Bluetooth 2.1+EDR, FM, etc.); a Broadcom® BCM4752 GPS receiver with accelerometer, altimeter, GPS, gyroscope, magnetometer; a Broadcom® BCM4335 transceiver chip (e.g., providing 2G, 3G, and 4G long-term evolution (LTE) cellular communications; 802.11ac, Bluetooth 4.0 low energy (LE) (e.g., beacon features)); a Broadcom® BCM43341 transceiver chip (e.g., providing 2G, 3G and 4G LTE cellular communications; 802.11 g/, Bluetooth 4.0, near field communication (NFC), FM radio); an Infineon Technologies® X-Gold 618-PMB9800 transceiver chip (e.g., providing 2G/3G HSDPA/HSUPA communications); a MediaTek® MT6620 transceiver chip (e.g., providing 802.11a/ac/b/g/n, Bluetooth 4.0 LE, FM, GPS; a Lapis Semiconductor® ML8511 UV sensor; a maxim integrated MAX44000 ambient light and infrared proximity sensor; a Texas Instruments® WiLink WL1283 transceiver chip (e.g., providing 802.11n, Bluetooth 3.0, FM, GPS); and/or the like. The system clock may have a crystal oscillator and generates a base signal through the computer systemization&#39;s circuit pathways. The clock may be coupled to the system bus and various clock multipliers that will increase or decrease the base operating frequency for other components interconnected in the computer systemization. The clock and various components in a computer systemization drive signals embodying information throughout the system. Such transmission and reception of instructions embodying information throughout a computer systemization may be referred to as communications. These communicative instructions may further be transmitted, received, and the cause of return and/or reply communications beyond the instant computer systemization to: communications networks, input devices, other computer systemizations, peripheral devices, and/or the like. It should be understood that in alternative embodiments, any of the above components may be connected directly to one another, connected to the CPU, and/or organized in numerous variations employed as exemplified by various computer systems. 
     The CPU comprises at least one high-speed data processor adequate to execute program components for executing user and/or system-generated requests. The CPU is often packaged in a number of formats varying from large supercomputer(s) and mainframe(s) computers, down to mini computers, servers, desktop computers, laptops, thin clients (e.g., Chromebooks®), netbooks, tablets (e.g., Android®, iPads®, and Windows® tablets, etc.), mobile smartphones (e.g., Android®, iPhones®, Nokia®, Palm® and Windows® phones, etc.), wearable device(s) (e.g., watches, glasses, goggles (e.g., Google Glass), etc.), and/or the like. Often, the processors themselves will incorporate various specialized processing units, such as, but not limited to: integrated system (bus) controllers, memory management control units, floating point units, and even specialized processing sub-units like graphics processing units, digital signal processing units, and/or the like. Additionally, processors may include internal fast access addressable memory, and be capable of mapping and addressing memory  3229  beyond the processor itself; internal memory may include, but is not limited to: fast registers, various levels of cache memory (e.g., level 1, 2, 3, etc.), RAM, etc. The processor may access this memory through the use of a memory address space that is accessible via instruction address, which the processor can construct and decode allowing it to access a circuit path to a specific memory address space having a memory state. The CPU may be a microprocessor such as: AMD&#39;s Athlon®, Duron® and/or Opteron®; Apple&#39;s® A series of processors (e.g., A5, A6, A7, A8, etc.); ARM&#39;s® application, embedded and secure processors; IBM® and/or Motorola&#39;s DragonBall® and PowerPC®; IBM&#39;s® and Sony&#39;s® Cell processor; Intel&#39;s® 80X86 series (e.g., 80386, 80486), Pentium®, Celeron®, Core (2) Duo®, i series (e.g., i3, i5, i7, etc.), Itanium®, Xeon®, and/or XScale®; Motorola&#39;s® 680X0 series (e.g., 68020, 68030, 68040, etc.); and/or the like processor(s). The CPU interacts with memory through instruction passing through conductive and/or transportive conduits (e.g., (printed) electronic and/or optic circuits) to execute stored instructions (i.e., program code) according to various data processing techniques. Such instruction passing facilitates communication within the MBR controller and beyond through various interfaces. Should processing requirements dictate a greater amount speed and/or capacity, distributed processors (e.g., see Distributed MBR below), mainframe, multi-core, parallel, and/or super-computer architectures may similarly be employed. Alternatively, should deployment requirements dictate greater portability, smaller mobile devices (e.g., Personal Digital Assistants (PDAs)) may be employed. 
     Depending on the particular implementation, features of the MBR may be achieved by implementing a microcontroller such as CAST&#39;s® R8051XC2 microcontroller; Intel&#39;s® MCS 51 (i.e., 8051 microcontroller); and/or the like. Also, to implement certain features of the MBR, some feature implementations may rely on embedded components, such as: Application-Specific Integrated Circuit (“ASIC”), Digital Signal Processing (“DSP”), Field Programmable Gate Array (“FPGA”), and/or the like embedded technology. For example, any of the MBR component collection (distributed or otherwise) and/or features may be implemented via the microprocessor and/or via embedded components; e.g., via ASIC, coprocessor, DSP, FPGA, and/or the like. Alternately, some implementations of the MBR may be implemented with embedded components that are configured and used to achieve a variety of features or signal processing. 
     Depending on the particular implementation, the embedded components may include software solutions, hardware solutions, and/or some combination of both hardware/software solutions. For example, MBR features discussed herein may be achieved through implementing FPGAs, which are a semiconductor devices containing programmable logic components called “logic blocks”, and programmable interconnects, such as the high performance FPGA Virtex® series and/or the low cost Spartan® series manufactured by Xilinx®. Logic blocks and interconnects can be programmed by the customer or designer, after the FPGA is manufactured, to implement any of the MBR features. A hierarchy of programmable interconnects allow logic blocks to be interconnected as needed by the MBR system designer/administrator, somewhat like a one-chip programmable breadboard. An FPGA&#39;s logic blocks can be programmed to perform the operation of basic logic gates such as AND, and XOR, or more complex combinational operators such as decoders or mathematical operations. In most FPGAs, the logic blocks also include memory elements, which may be circuit flip-flops or more complete blocks of memory. In some circumstances, the MBR may be developed on FPGAs and then migrated into a fixed version that more resembles ASIC implementations. Alternate or coordinating implementations may migrate MBR controller features to a final ASIC instead of or in addition to FPGAs. Depending on the implementation all of the aforementioned embedded components and microprocessors may be considered the “CPU” and/or “processor” for the MBR. 
     Power Source 
     The power source  3286  may be of any various form for powering small electronic circuit board devices such as the following power cells: alkaline, lithium hydride, lithium ion, lithium polymer, nickel cadmium, solar cells, and/or the like. Other types of AC or DC power sources may be used as well. In the case of solar cells, in one embodiment, the case provides an aperture through which the solar cell may capture photonic energy. The power cell  3286  is connected to at least one of the interconnected subsequent components of the MBR thereby providing an electric current to all subsequent components. In one example, the power source  3286  is connected to the system bus component  3204 . In an alternative embodiment, an outside power source  3286  is provided through a connection across the I/O  3208  interface. For example, a USB and/or IEEE 1394 connection carries both data and power across the connection and is therefore a suitable source of power. 
     Interface Adapters 
     Interface bus(ses)  3207  may accept, connect, and/or communicate to a number of interface adapters, variously although not necessarily in the form of adapter cards, such as but not limited to: input output interfaces (I/O)  3208 , storage interfaces  3209 , network interfaces  3210 , and/or the like. Optionally, cryptographic processor interfaces  3227  similarly may be connected to the interface bus. The interface bus provides for the communications of interface adapters with one another as well as with other components of the computer systemization. Interface adapters are adapted for a compatible interface bus. Interface adapters variously connect to the interface bus via a slot architecture. Various slot architectures may be employed, such as, but not limited to: Accelerated Graphics Port (AGP), Card Bus, (Extended) Industry Standard Architecture ((E)ISA), Micro Channel Architecture (MCA), NuBus, Peripheral Component Interconnect (Extended) (PCI(X)), PCI Express, Personal Computer Memory Card International Association (PCMCIA), and/or the like. 
     Storage interfaces  3209  may accept, communicate, and/or connect to a number of storage devices such as, but not limited to: storage devices  3214 , removable disc devices, and/or the like. Storage interfaces may employ connection protocols such as, but not limited to: (Ultra) (Serial) Advanced Technology Attachment (Packet Interface) ((Ultra) (Serial) ATA(PI)), (Enhanced) Integrated Drive Electronics ((E)IDE), Institute of Electrical and Electronics Engineers (IEEE) 1394, fiber channel, Small Computer Systems Interface (SCSI), Universal Serial Bus (USB), and/or the like. 
     Network interfaces  3210  may accept, communicate, and/or connect to a communications network  3213 . Through a communications network  3213 , the MBR controller is accessible through remote clients  3233   b  (e.g., computers with web browsers) by users  3233   a . Network interfaces may employ connection protocols such as, but not limited to: direct connect, Ethernet (thick, thin, twisted pair 10/100/1000/10000 Base T, and/or the like), Token Ring, wireless connection such as IEEE 802.11a-x, and/or the like. Should processing requirements dictate a greater amount speed and/or capacity, distributed network controllers (e.g., see Distributed MBR below), architectures may similarly be employed to pool, load balance, and/or otherwise decrease/increase the communicative bandwidth required by the MBR controller. A communications network may be any one and/or the combination of the following: a direct interconnection; the Internet; Interplanetary Internet (e.g., Coherent File Distribution Protocol (CFDP), Space Communications Protocol Specifications (SCPS), etc.); a Local Area Network (LAN); a Metropolitan Area Network (MAN); an Operating Missions as Nodes on the Internet (OMNI); a secured custom connection; a Wide Area Network (WAN); a wireless network (e.g., employing protocols such as, but not limited to a cellular, WiFi, Wireless Application Protocol (WAP), I-mode, and/or the like); and/or the like. A network interface may be regarded as a specialized form of an input output interface. Further, multiple network interfaces  3210  may be used to engage with various communications network types  3213 . For example, multiple network interfaces may be employed to allow for the communication over broadcast, multicast, and/or unicast networks. 
     Input Output interfaces (I/O)  3208  may accept, communicate, and/or connect to user, peripheral devices  3212  (e.g., input devices  3211 ), cryptographic processor devices  3228 , and/or the like. I/O may employ connection protocols such as, but not limited to: audio: analog, digital, monaural, RCA, stereo, and/or the like; data: Apple Desktop Bus (ADB), IEEE 1394a-b, serial, universal serial bus (USB); infrared; joystick; keyboard; midi; optical; PC AT; PS/2; parallel; radio; touch interfaces: capacitive, optical, resistive, etc. displays; video interface: Apple Desktop Connector (ADC), BNC, coaxial, component, composite, digital, Digital Visual Interface (DVI), (mini) displayport, high-definition multimedia interface (HDMI), RCA, RF antennae, S-Video, VGA, and/or the like; wireless transceivers: 802.11a/ac/b/g/n/x; Bluetooth; cellular (e.g., code division multiple access (CDMA), high speed packet access (HSPA(+)), high-speed downlink packet access (HSDPA), global system for mobile communications (GSM), long term evolution (LTE), WiMax, etc.); and/or the like. One output device may include a video display, which may comprise a Cathode Ray Tube (CRT) or Liquid Crystal Display (LCD) based monitor with an interface (e.g., DVI circuitry and cable) that accepts signals from a video interface, may be used. The video interface composites information generated by a computer systemization and generates video signals based on the composited information in a video memory frame. Another output device is a television set, which accepts signals from a video interface. The video interface provides the composited video information through a video connection interface that accepts a video display interface (e.g., an RCA composite video connector accepting an RCA composite video cable; a DVI connector accepting a DVI display cable, etc.). 
     Peripheral devices  3212  may be connected and/or communicate to I/O and/or other facilities of the like such as network interfaces, storage interfaces, directly to the interface bus, system bus, the CPU, and/or the like. Peripheral devices may be external, internal and/or part of the MBR controller. Peripheral devices may include: antenna, audio devices (e.g., line-in, line-out, microphone input, speakers, etc.), cameras (e.g., gesture (e.g., Microsoft Kinect) detection, motion detection, still, video, webcam, etc.), dongles (e.g., for copy protection, ensuring secure transactions with a digital signature, and/or the like), external processors (for added capabilities; e.g., crypto devices  528 ), force-feedback devices (e.g., vibrating motors), infrared (IR) transceiver, network interfaces, printers, scanners, sensors/sensor arrays and peripheral extensions (e.g., ambient light, GPS, gyroscopes, proximity, temperature, etc.), storage devices, transceivers (e.g., cellular, GPS, etc.), video devices (e.g., goggles, monitors, etc.), video sources, visors, and/or the like. Peripheral devices often include types of input devices (e.g., cameras). 
     User input devices  3211  often are a type of peripheral device  512  (see above) and may include: card readers, dongles, finger print readers, gloves, graphics tablets, joysticks, keyboards, microphones, mouse (mice), remote controls, security/biometric devices (e.g., fingerprint reader, iris reader, retina reader, etc.), touch screens (e.g., capacitive, resistive, etc.), trackballs, trackpads, styluses, and/or the like. 
     It should be noted that although user input devices and peripheral devices may be employed, the MBR controller may be embodied as an embedded, dedicated, and/or monitor-less (i.e., headless) device, wherein access would be provided over a network interface connection. 
     Cryptographic units such as, but not limited to, microcontrollers, processors  3226 , interfaces  3227 , and/or devices  3228  may be attached, and/or communicate with the MBR controller. A MC68HC16 microcontroller, manufactured by Motorola, Inc.®, may be used for and/or within cryptographic units. The MC68HC16 microcontroller utilizes a 16-bit multiply-and-accumulate instruction in the 16 MHz configuration and requires less than one second to perform a 512-bit RSA private key operation. Cryptographic units support the authentication of communications from interacting agents, as well as allowing for anonymous transactions. Cryptographic units may also be configured as part of the CPU. Equivalent microcontrollers and/or processors may also be used. Other specialized cryptographic processors include: Broadcom&#39;s® CryptoNetX and other Security Processors; nCipher&#39;s® nShield; SafeNet&#39;s® Luna PCI (e.g., 7100) series; Semaphore Communications&#39;® 40 MHz Roadrunner 184; Sun&#39;s® Cryptographic Accelerators (e.g., Accelerator 6000 PCIe Board, Accelerator 500 Daughtercard); Via Nano® Processor (e.g., L2100, L2200, U2400) line, which is capable of performing 500+MB/s of cryptographic instructions; VLSI Technology&#39;s® 33 MHz 6868; and/or the like. 
     Memory 
     Generally, any mechanization and/or embodiment allowing a processor to affect the storage and/or retrieval of information is regarded as memory  3229 . However, memory is a fungible technology and resource, thus, any number of memory embodiments may be employed in lieu of or in concert with one another. It is to be understood that the MBR controller and/or a computer systemization may employ various forms of memory  3229 . For example, a computer systemization may be configured wherein the operation of on-chip CPU memory (e.g., registers), RAM, ROM, and any other storage devices are provided by a paper punch tape or paper punch card mechanism; however, such an embodiment would result in an extremely slow rate of operation. In one configuration, memory  3229  will include ROM  3206 , RAM  3205 , and a storage device  3214 . A storage device  3214  may be any various computer system storage. Storage devices may include: an array of devices (e.g., Redundant Array of Independent Disks (RAID)); a drum; a (fixed and/or removable) magnetic disk drive; a magneto-optical drive; an optical drive (i.e., Blueray, CD ROM/RAM/Recordable (R)/ReWritable (RW), DVD R/RW, HD DVD R/RW etc.); RAM drives; solid state memory devices (USB memory, solid state drives (SSD), etc.); other processor-readable storage mediums; and/or other devices of the like. Thus, a computer systemization generally requires and makes use of memory. 
     Component Collection 
     The memory  3229  may contain a collection of program and/or database components and/or data such as, but not limited to: operating system component(s)  3215  (operating system); information server component(s)  3216  (information server); user interface component(s)  3217  (user interface); Web browser component(s)  3218  (Web browser); database(s)  3219 ; mail server component(s)  3221 ; mail client component(s)  3222 ; cryptographic server component(s)  3220  (cryptographic server); the MBR component(s)  3235 ; and/or the like (i.e., collectively a component collection). These components may be stored and accessed from the storage devices and/or from storage devices accessible through an interface bus. Although unconventional program components such as those in the component collection may be stored in a local storage device  3214 , they may also be loaded and/or stored in memory such as: peripheral devices, RAM, remote storage facilities through a communications network, ROM, various forms of memory, and/or the like. 
     Operating System 
     The operating system component  3215  is an executable program component facilitating the operation of the MBR controller. The operating system may facilitate access of I/O, network interfaces, peripheral devices, storage devices, and/or the like. The operating system may be a highly fault tolerant, scalable, and secure system such as: Apple&#39;s Macintosh OS X (Server) and macOS®; AT&amp;T Plan 9®; Be OS®; Blackberry&#39;s QNX®; Google&#39;s Chrome®; Microsoft&#39;s Windows® 7/8/10; Unix and Unix-like system distributions (such as AT&amp;T&#39;s UNIX®; Berkley Software Distribution (BSD)® variations such as FreeBSD®, NetBSD, OpenBSD, and/or the like; Linux distributions such as Red Hat, Ubuntu, and/or the like); and/or the like operating systems. However, more limited and/or less secure operating systems also may be employed such as Apple Macintosh OS® (i.e., versions 1-9), IBM OS/2®, Microsoft DOS®, Microsoft Windows 2000/2003/3.1/95/98/CE/Millenium/Mobile/NT/Vista/XP (Server)®, Palm OS®, and/or the like. Additionally, for robust mobile deployment applications, mobile operating systems may be used, such as: Apple&#39;s iOS®; China Operating System COS®; Google&#39;s Android®; Microsoft Windows RT/Phone®; Palm&#39;s WebOS®; Samsung/Intel&#39;s Tizen®; and/or the like. An operating system may communicate to and/or with other components in a component collection, including itself, and/or the like. Most frequently, the operating system communicates with other program components, user interfaces, and/or the like. For example, the operating system may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, and/or responses. The operating system, once executed by the CPU, may enable the interaction with communications networks, data, I/O, peripheral devices, program components, memory, user input devices, and/or the like. The operating system may provide communications protocols that allow the MBR controller to communicate with other entities through a communications network  3213 . Various communication protocols may be used by the MBR controller as a subcarrier transport mechanism for interaction, such as, but not limited to: multicast, TCP/IP, UDP, unicast, and/or the like. 
     Information Server 
     An information server component  3216  is a stored program component that is executed by a CPU. The information server may be a an Internet information server such as, but not limited to Apache Software Foundation&#39;s Apache, Microsoft&#39;s Internet Information Server, and/or the like. The information server may allow for the execution of program components through facilities such as Active Server Page (ASP), ActiveX, (ANSI) (Objective-) C (++), C# and/or .NET, Common Gateway Interface (CGI) scripts, dynamic (D) hypertext markup language (HTML), FLASH, Java, JavaScript, Practical Extraction Report Language (PER_L), Hypertext Pre-Processor (PHP), pipes, Python, wireless application protocol (WAP), WebObjects®, and/or the like. The information server may support secure communications protocols such as, but not limited to, File Transfer Protocol (FTP); HyperText Transfer Protocol (HTTP); Secure Hypertext Transfer Protocol (HTTPS), Secure Socket Layer (SSL), messaging protocols (e.g., America Online (AOL) Instant Messenger (AIM)®, Application Exchange (APEX), ICQ, Internet Relay Chat (IRC), Microsoft Network (MSN) Messenger® Service, Presence and Instant Messaging Protocol (PRIM), Internet Engineering Task Force&#39;s® (IETF&#39;s) Session Initiation Protocol (SIP), SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE), open XML-based Extensible Messaging and Presence Protocol (XMPP) (i.e., Jabber® or Open Mobile Alliance&#39;s (OMA&#39;s) Instant Messaging and Presence Service (IMPS)), Yahoo! Instant Messenger® Service, and/or the like. The information server provides results in the form of Web pages to Web browsers, and allows for the manipulated generation of the Web pages through interaction with other program components. After a Domain Name System (DNS) resolution portion of an HTTP request is resolved to a particular information server, the information server resolves requests for information at specified locations on the MBR controller based on the remainder of the HTTP request. For example, a request such as http://123.124.125.126/myInformation.html might have the IP portion of the request “123.124.125.126” resolved by a DNS server to an information server at that IP address; that information server might in turn further parse the http request for the “/myInformation.html” portion of the request and resolve it to a location in memory containing the information “myInformation.html.” Additionally, other information serving protocols may be employed across various ports, e.g., FTP communications across port 21, and/or the like. An information server may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the information server communicates with the MBR database  3219 , operating systems, other program components, user interfaces, Web browsers, and/or the like. 
     Access to the MBR database may be achieved through a number of database bridge mechanisms such as through scripting languages as enumerated below (e.g., CGI) and through inter-application communication channels as enumerated below (e.g., CORBA, WebObjects, etc.). Any data requests through a Web browser are parsed through the bridge mechanism into appropriate grammars as required by the MBR. In one embodiment, the information server would provide a Web form accessible by a Web browser. Entries made into supplied fields in the Web form are tagged as having been entered into the particular fields, and parsed as such. The entered terms are then passed along with the field tags, which act to instruct the parser to generate queries directed to appropriate tables and/or fields. In one embodiment, the parser may generate queries in SQL by instantiating a search string with the proper join/select commands based on the tagged text entries, wherein the resulting command is provided over the bridge mechanism to the MBR as a query. Upon generating query results from the query, the results are passed over the bridge mechanism, and may be parsed for formatting and generation of a new results Web page by the bridge mechanism. Such a new results Web page is then provided to the information server, which may supply it to the requesting Web browser. 
     Also, an information server may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, and/or responses. 
     User Interface 
     Computer interfaces in some respects are similar to automobile operation interfaces. Automobile operation interface elements such as steering wheels, gearshifts, and speedometers facilitate the access, operation, and display of automobile resources, and status. Computer interaction interface elements such as buttons, check boxes, cursors, menus, scrollers, and windows (collectively referred to as widgets) similarly facilitate the access, capabilities, operation, and display of data and computer hardware and operating system resources, and status. Operation interfaces are called user interfaces. Graphical user interfaces (GUIs) such as the Apple&#39;s iOS®, Macintosh Operating System&#39;s Aqua®; IBM&#39;s OS/2®; Google&#39;s Chrome® (e.g., and other webbrowser/cloud based client OSs); Microsoft&#39;s Windows® varied UIs 2000/2003/3.1/95/98/CE/Millenium/Mobile/NT/Vista/XP (Server) (i.e., Aero, Surface, etc.); Unix&#39;s X-Windows (e.g., which may include additional Unix graphic interface libraries and layers such as K Desktop Environment (KDE), mythTV and GNU Network Object Model Environment (GNOME)), web interface libraries (e.g., ActiveX, AJAX, (D)HTML, FLASH, Java, JavaScript, etc. interface libraries such as, but not limited to, Dojo, jQuery(UI), MooTools, Prototype, script.aculo.us, SWFObject, Yahoo! User Interface®, any of which may be used and) provide a baseline and means of accessing and displaying information graphically to users. 
     A user interface component  3217  is a stored program component that is executed by a CPU. The user interface may be a graphic user interface as provided by, with, and/or atop operating systems and/or operating environments such as already discussed. The user interface may allow for the display, execution, interaction, manipulation, and/or operation of program components and/or system facilities through textual and/or graphical facilities. The user interface provides a facility through which users may affect, interact, and/or operate a computer system. A user interface may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the user interface communicates with operating systems, other program components, and/or the like. The user interface may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, and/or responses. 
     Web Browser 
     A Web browser component  3218  is a stored program component that is executed by a CPU. The Web browser may be a hypertext viewing application such as Apple&#39;s (mobile) Safari®, Google&#39;s Chrome®, Microsoft Internet Explorer®, Mozilla&#39;s Firefox®, Netscape Navigator®, and/or the like. Secure Web browsing may be supplied with 128 bit (or greater) encryption by way of HTTPS, SSL, and/or the like. Web browsers allowing for the execution of program components through facilities such as ActiveX, AJAX, (D)HTML, FLASH, Java, JavaScript, web browser plug-in APIs (e.g., FireFox®, Safari® Plug-in, and/or the like APIs), and/or the like. Web browsers and like information access tools may be integrated into PDAs, cellular telephones, and/or other mobile devices. A Web browser may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the Web browser communicates with information servers, operating systems, integrated program components (e.g., plug-ins), and/or the like; e.g., it may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, and/or responses. Also, in place of a Web browser and information server, a combined application may be developed to perform similar operations of both. The combined application would similarly affect the obtaining and the provision of information to users, user agents, and/or the like from the MBR enabled nodes. The combined application may be nugatory on systems employing Web browsers. 
     Mail Server 
     A mail server component  3221  is a stored program component that is executed by a CPU  3203 . The mail server may be an Internet mail server such as, but not limited to: dovecot, Courier IMAP, Cyrus IMAP, Maildir, Microsoft Exchange, sendmail, and/or the like. The mail server may allow for the execution of program components through facilities such as ASP, ActiveX, (ANSI) (Objective-) C (++), C# and/or .NET, CGI scripts, Java, JavaScript, PER_L, PHP, pipes, Python, WebObjects®, and/or the like. The mail server may support communications protocols such as, but not limited to: Internet message access protocol (IMAP), Messaging Application Programming Interface (MAPI)/Microsoft Exchange, post office protocol (POPS), simple mail transfer protocol (SMTP), and/or the like. The mail server can route, forward, and process incoming and outgoing mail messages that have been sent, relayed and/or otherwise traversing through and/or to the MBR. Alternatively, the mail server component may be distributed out to mail service providing entities such as Google&#39;s® cloud services (e.g., Gmail and notifications may alternatively be provided via messenger services such as AOL&#39;s Instant Messenger®, Apple&#39;s iMessage®, Google Messenger®, SnapChat®, etc.). 
     Access to the MBR mail may be achieved through a number of APIs offered by the individual Web server components and/or the operating system. 
     Also, a mail server may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, information, and/or responses. 
     Mail Client 
     A mail client component  3222  is a stored program component that is executed by a CPU  3203 . The mail client may be a mail viewing application such as Apple Mail®, Microsoft Entourage®, Microsoft Outlook®, Microsoft Outlook Express®, Mozilla®, Thunderbird®, and/or the like. Mail clients may support a number of transfer protocols, such as: IMAP, Microsoft Exchange, POPS, SMTP, and/or the like. A mail client may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the mail client communicates with mail servers, operating systems, other mail clients, and/or the like; e.g., it may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, information, and/or responses. Generally, the mail client provides a facility to compose and transmit electronic mail messages. 
     Cryptographic Server 
     A cryptographic server component  3220  is a stored program component that is executed by a CPU  3203 , cryptographic processor  3226 , cryptographic processor interface  3227 , cryptographic processor device  3228 , and/or the like. Cryptographic processor interfaces will allow for expedition of encryption and/or decryption requests by the cryptographic component; however, the cryptographic component, alternatively, may run on a CPU. The cryptographic component allows for the encryption and/or decryption of provided data. The cryptographic component allows for both symmetric and asymmetric (e.g., Pretty Good Protection (PGP)) encryption and/or decryption. The cryptographic component may employ cryptographic techniques such as, but not limited to: digital certificates (e.g., X.509 authentication framework), digital signatures, dual signatures, enveloping, password access protection, public key management, and/or the like. The cryptographic component will facilitate numerous (encryption and/or decryption) security protocols such as, but not limited to: checksum, Data Encryption Standard (DES), Elliptical Curve Encryption (ECC), International Data Encryption Algorithm (IDEA), Message Digest 5 (MD5, which is a one way hash operation), passwords, Rivest Cipher (RC5), Rijndael, RSA (which is an Internet encryption and authentication system that uses an algorithm developed in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman), Secure Hash Algorithm (SHA), Secure Socket Layer (SSL), Secure Hypertext Transfer Protocol (HTTPS), Transport Layer Security (TLS), and/or the like. Employing such encryption security protocols, the MBR may encrypt all incoming and/or outgoing communications and may serve as node within a virtual private network (VPN) with a wider communications network. The cryptographic component facilitates the process of “security authorization” whereby access to a resource is inhibited by a security protocol wherein the cryptographic component effects authorized access to the secured resource. In addition, the cryptographic component may provide unique identifiers of content, e.g., employing and MD5 hash to obtain a unique signature for an digital audio file. A cryptographic component may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. The cryptographic component supports encryption schemes allowing for the secure transmission of information across a communications network to allow the MBR component to engage in secure transactions if so desired. The cryptographic component facilitates the secure accessing of resources on the MBR and facilitates the access of secured resources on remote systems; i.e., it may act as a client and/or server of secured resources. Most frequently, the cryptographic component communicates with information servers, operating systems, other program components, and/or the like. The cryptographic component may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, and/or responses. 
     The MBR Database 
     The MBR database component  3219  may be embodied in a database and its stored data. The database is a stored program component, which is executed by the CPU; the stored program component portion configuring the CPU to process the stored data. The database may be a fault tolerant, relational, scalable, secure database such as MySQL®, Oracle®, Sybase®, etc. may be used. Additionally, optimized fast memory and distributed databases such as IBM&#39;s Netezza®, MongoDB&#39;s MongoDB®, opensource Hadoop®, opensource VoltDB, SAP&#39;s Hana®, etc. Relational databases are an extension of a flat file. Relational databases consist of a series of related tables. The tables are interconnected via a key field. Use of the key field allows the combination of the tables by indexing against the key field; i.e., the key fields act as dimensional pivot points for combining information from various tables. Relationships generally identify links maintained between tables by matching primary keys. Primary keys represent fields that uniquely identify the rows of a table in a relational database. Alternative key fields may be used from any of the fields having unique value sets, and in some alternatives, even non-unique values in combinations with other fields. More precisely, they uniquely identify rows of a table on the “one” side of a one-to-many relationship. 
     Alternatively, the MBR database may be implemented using various other data-structures, such as an array, hash, (linked) list, struct, structured text file (e.g., XML), table, and/or the like. Such data-structures may be stored in memory and/or in (structured) files. In another alternative, an object-oriented database may be used, such as Frontier™, ObjectStore, Poet, Zope, and/or the like. Object databases can include a number of object collections that are grouped and/or linked together by common attributes; they may be related to other object collections by some common attributes. Object-oriented databases perform similarly to relational databases with the exception that objects are not just pieces of data but may have other types of capabilities encapsulated within a given object. If the MBR database is implemented as a data-structure, the use of the MBR database  3219  may be integrated into another component such as the MBR component  3235 . Also, the database may be implemented as a mix of data structures, objects, and relational structures. Databases may be consolidated and/or distributed in countless variations (e.g., see Distributed MBR below). Portions of databases, e.g., tables, may be exported and/or imported and thus decentralized and/or integrated. 
     In one embodiment, the database component  3219  includes several tables  3219   a - o:    
     An accounts table  3219   a  includes fields such as, but not limited to: an accountID, accountOwnerID, accountContactID, assetIDs, deviceIDs, paymentIDs, transactionIDs, userIDs, accountType (e.g., agent, entity (e.g., corporate, non-profit, partnership, etc.), individual, etc.), accountCreationDate, accountUpdateDate, accountName, accountNumber, routingNumber, linkWalletsID, accountPrioritAccaountRatio, accountAddress, accountState, accountZIPcode, accountCountry, accountEmail, accountPhone, accountAuthKey, accountIPaddress, accountURLAccessCode, accountPortNo, accountAuthorizationCode, accountAccessPrivileges, accountPreferences, accountRestrictions, and/or the like; 
     A users table  3219   b  includes fields such as, but not limited to: a userID, userSSN, taxID, userContactID, accountID, assetIDs, deviceIDs, paymentIDs, transactionIDs, userType (e.g., agent, entity (e.g., corporate, non-profit, partnership, etc.), individual, etc.), namePrefix, firstName, middleName, lastName, nameSuffix, DateOfBirth, userAge, userName, userEmail, userSocialAccountID, contactType, contactRelationship, userPhone, userAddress, userCity, userState, userZIPCode, userCountry, userAuthorizationCode, userAccessPrivilges, userPreferences, userRestrictions, and/or the like (the user table may support and/or track multiple entity accounts on a MBR); 
     An devices table  3219   c  includes fields such as, but not limited to: deviceID, sensorIDs, accountID, assetIDs, paymentIDs, deviceType, deviceName, deviceManufacturer, deviceModel, deviceVersion, deviceSerialNo, deviceIPaddress, deviceMACaddress, device_ECID, deviceUUID, deviceLocation, deviceCertificate, deviceOS, appIDs, deviceResources, deviceVersion, authKey, deviceSecureKey, walletAppInstalledFlag, deviceAccessPrivileges, devicePreferences, deviceRestrictions, hardware_config, software_config, storage_location, sensor_value, pin_reading, data_length, channel_requirement, sensor_name, sensor_model_no, sensor_manufacturer, sensor_type, sensor_serial_number, sensor_power_requirement, device_power_requirement, location, sensor_associated_tool, sensor_dimensions, device_dimensions, sensor_communications_type, device_communications_type, power_percentage, power_condition, temperature_setting, speed_adjust, hold_duration, part_actuation, and/or the like. Device table may, in some embodiments, include fields corresponding to one or more Bluetooth profiles, such as those published at https://www.bluetooth.org/en-us/specification/adopted-specifications, and/or other device specifications, and/or the like; 
     An apps table  3219   d  includes fields such as, but not limited to: appID, appName, appType, appDependencies, accountID, deviceIDs, transactionID, userID, appStoreAuthKey, appStoreAccountID, appStoreIPaddress, appStoreURLaccessCode, appStorePortNo, appAccessPrivileges, appPreferences, appRestrictions, portNum, access_API_call, linked_wallets_list, and/or the like; 
     An assets table  3219   e  includes fields such as, but not limited to: assetID, accountID, userID, distributorAccountID, distributorPaymentID, distributorOnwerID, assetOwnerID, assetType, assetSourceDeviceID, assetSourceDeviceType, assetSourceDeviceName, assetSourceDistributionChannelID, assetSourceDistributionChannelType, assetSourceDistributionChannelName, assetTargetChannelID, assetTargetChannelType, assetTargetChannelName, assetName, assetSeriesName, assetSeriesSeason, assetSeriesEpisode, assetCode, assetQuantity, assetCost, assetPrice, assetValue, assetManufactuer, assetModelNo, assetSerialNo, assetLocation, assetAddress, assetState, assetZIPcode, assetState, assetCountry, assetEmail, assetIPaddress, assetURLaccessCode, assetOwnerAccountID, subscriptionIDs, assetAuthroizationCode, assetAccessPrivileges, assetPreferences, assetRestrictions, assetAPI, assetAPIconnectionAddress, and/or the like; 
     A payments table  3219   f  includes fields such as, but not limited to: paymentID, accountID, userID, couponID, couponValue, couponConditions, couponExpiration, paymentType, paymentAccountNo, paymentAccountName, paymentAccountAuthorizationCodes, paymentExpirationDate, paymentCCV, paymentRoutingNo, paymentRoutingType, paymentAddress, paymentState, paymentZIPcode, paymentCountry, paymentEmail, paymentAuthKey, paymentIPaddress, paymentURLaccessCode, paymentPortNo, paymentAccessPrivileges, paymentPreferences, payementRestrictions, and/or the like; 
     An transactions table  3219   g  includes fields such as, but not limited to: transactionID, accountID, assetIDs, deviceIDs, paymentIDs, transactionIDs, userID, merchantID, transactionType, transactionDate, transactionTime, transactionAmount, transactionQuantity, transactionDetails, productsList, productType, productTitle, productsSummary, productParamsList, transactionNo, transactionAccessPrivileges, transactionPreferences, transactionRestrictions, merchantAuthKey, merchantAuthCode, and/or the like; 
     An merchants table  3219   h  includes fields such as, but not limited to: merchantID, merchantTaxID, merchanteName, merchantContactUserID, accountID, issuerID, acquirerID, merchantEmail, merchantAddress, merchantState, merchantZIPcode, merchantCountry, merchantAuthKey, merchantIPaddress, portNum, merchantURLaccessCode, merchantPortNo, merchantAccessPrivileges, merchantPreferences, merchantRestrictions, and/or the like; 
     An ads table  3219   i  includes fields such as, but not limited to: adID, advertiserID, adMerchantID, adNetworkID, adName, adTags, advertiserName, adSponsor, adTime, adGeo, adAttributes, adFormat, adProduct, adText, adMedia, adMediaID, adChannelID, adTagTime, adAudioSignature, adHash, adTemplateID, adTemplateData, adSourceID, adSourceName, adSourceServerlP, adSourceURL, adSourceSecurityProtocol, adSourceFTP, adAuthKey, adAccessPrivileges, adPreferences, adRestrictions, adNetworkXchangeID, adNetworkXchangeName, adNetworkXchangeCost, adNetworkXchangeMetricType (e.g., CPA, CPC, CPM, CTR, etc.), adNetworkXchangeMetricValue, adNetworkXchangeServer, adNetworkXchangePortNumber, publisherID, publisherAddress, publisherURL, publisherTag, publisherIndustry, publisherName, publisherDescription, siteDomain, siteURL, siteContent, siteTag, siteContext, siteImpression, siteVisits, siteHeadline, sitePage, siteAdPrice, sitePlacement, sitePosition, bidID, bidExchange, bidOS, bidTarget, bidTimestamp, bidPrice, bidlmpressionID, bidType, bidScore, adType (e.g., mobile, desktop, wearable, largescreen, interstitial, etc.), assetID, merchantID, deviceID, userID, accountID, impressionID, impressionOS, impressionTimeStamp, impressionGeo, impressionAction, impressionType, impressionPublisherID, impressionPublisherURL, and/or the like; 
     A performance logs table  3219   j  includes fields such as, but not limited to: deviceID, accountID, performanceCharacteristicsData, numberOfPasses, passID, dataPerPass, completionTimePerPass, usageIntensity, numberOfUsers, dataBlocksChangeFrequency, matchingUsageProfileIDs, and/or the like; 
     A usage profiles table  3219   k  includes fields such as, but not limited to: usageProfileID, usageProfileDescriptor, deviceID, accountID, timeRange, dayOfWeek, numberOfUsers, usageProfileFinalizationConfigurationSettings, usageProfilePredictiveOptimizationConfigurationSettings, usageProfileLookaheadOptimizationConfigurationSettings, and/or the like; 
     A services table  32191  includes fields such as, but not limited to: serviceID, serviceName, serviceURL, and/or the like; 
     A mappings table  3219   m  includes fields such as, but not limited to: accountID (e.g., of entity), userID, serviceID, serviceAuthenticationDataForUser, serviceBackupScheduleForUser, sourceNodeID, sourceNodeBackupVolume, targetNodeID, targetNodeReplicationVolume, and/or the like; 
     A recovery priorities table  3219   n  includes fields such as, but not limited to: recoveryPrioritizationIndexID, sourceDeviceID, userID, dataBlockID, dataBlockEssentialFlag, dataBlockRecoveryPriority, dataBlockAssociatedApplication, dataBlockAssociatedDataset, dataBlockLastAccessTime, dataBlockAccessFrequencyCount, and/or the like; 
     A source-nonspecific configuration table  32190  includes fields such as, but not limited to: sourceNonspecificLocationldentifier, sourceNonspecificLocationDescription, sourceNonspecificLocationNetworkLocation, sourceNonspecificLocationAssociatedDevices, and/or the like. 
     In one embodiment, the MBR database may interact with other database systems. For example, employing a distributed database system, queries and data access by search MBR component may treat the combination of the MBR database, an integrated data security layer database as a single database entity (e.g., see Distributed MBR below). 
     In one embodiment, user programs may contain various user interface primitives, which may serve to update the MBR. Also, various accounts may require custom database tables depending upon the environments and the types of clients the MBR may need to serve. It should be noted that any unique fields may be designated as a key field throughout. In an alternative embodiment, these tables have been decentralized into their own databases and their respective database controllers (i.e., individual database controllers for each of the above tables). Employing various data processing techniques, one may further distribute the databases over several computer systemizations and/or storage devices. Similarly, configurations of the decentralized database controllers may be varied by consolidating and/or distributing the various database components  3219   a - o . The MBR may be configured to keep track of various settings, inputs, and parameters via database controllers. 
     The MBR database may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the MBR database communicates with the MBR component, other program components, and/or the like. The database may contain, retain, and provide information regarding other nodes and data. 
     The MBRs 
     The MBR component  3235  is a stored program component that is executed by a CPU. In one embodiment, the MBR component incorporates any and/or all combinations of the aspects of the MBR that was discussed in the previous figures. As such, the MBR affects accessing, obtaining and the provision of information, services, transactions, and/or the like across various communications networks. The features and embodiments of the MBR discussed herein increase network efficiency by reducing data transfer requirements the use of more efficient data structures and mechanisms for their transfer and storage. As a consequence, more data may be transferred in less time, and latencies with regard to transactions, are also reduced. In many cases, such reduction in storage, transfer time, bandwidth requirements, latencies, etc., will reduce the capacity and structural infrastructure requirements to support the MBR&#39;s features and facilities, and in many cases reduce the costs, energy consumption/requirements, and extend the life of MBR&#39;s underlying infrastructure; this has the added benefit of making the MBR more reliable. Similarly, many of the features and mechanisms are designed to be easier for users to use and access, thereby broadening the audience that may enjoy/employ and exploit the feature sets of the MBR; such ease of use also helps to increase the reliability of the MBR. In addition, the feature sets include heightened security as noted via the Cryptographic components  3220 ,  3226 ,  3228  and throughout, making access to the features and data more reliable and secure 
     The MBR transforms backup configuration request, restore request inputs, via MBR components (e.g., PBP, PRP, SNBP, SNRP, VMRP), into backup configuration response, restore response outputs. 
     The MBR component enabling access of information between nodes may be developed by employing various development tools and languages such as, but not limited to: Apache® components, Assembly, ActiveX, binary executables, (ANSI) (Objective-) C (++), C# and/or .NET, database adapters, CGI scripts, Java, JavaScript, mapping tools, procedural and object oriented development tools, PERL, PHP, Python, shell scripts, SQL commands, web application server extensions, web development environments and libraries (e.g., Microsoft&#39;s® ActiveX; Adobe® AIR, FLEX &amp; FLASH; AJAX; (D)HTML; Dojo, Java; JavaScript; jQuery(UI); MooTools; Prototype; script.aculo.us; Simple Object Access Protocol (SOAP); SWFObject; Yahoo!® User Interface; and/or the like), WebObjects®, and/or the like. In one embodiment, the MBR server employs a cryptographic server to encrypt and decrypt communications. The MBR component may communicate to and/or with other components in a component collection, including itself, and/or facilities of the like. Most frequently, the MBR component communicates with the MBR database, operating systems, other program components, and/or the like. The MBR may contain, communicate, generate, obtain, and/or provide program component, system, user, and/or data communications, requests, and/or responses. 
     Distributed MBRs 
     The structure and/or operation of any of the MBR node controller components may be combined, consolidated, and/or distributed in any number of ways to facilitate development and/or deployment. Similarly, the component collection may be combined in any number of ways to facilitate deployment and/or development. To accomplish this, one may integrate the components into a common code base or in a facility that can dynamically load the components on demand in an integrated fashion. As such a combination of hardware may be distributed within a location, within a region and/or globally where logical access to a controller may be abstracted as a singular node, yet where a multitude of private, semiprivate and publically accessible node controllers (e.g., via dispersed data centers) are coordinated to serve requests (e.g., providing private cloud, semi-private cloud, and public cloud computing resources) and allowing for the serving of such requests in discrete regions (e.g., isolated, local, regional, national, global cloud access). 
     The component collection may be consolidated and/or distributed in countless variations through various data processing and/or development techniques. Multiple instances of any one of the program components in the program component collection may be instantiated on a single node, and/or across numerous nodes to improve performance through load-balancing and/or data-processing techniques. Furthermore, single instances may also be distributed across multiple controllers and/or storage devices; e.g., databases. All program component instances and controllers working in concert may do so through various data processing communication techniques. 
     The configuration of the MBR controller will depend on the context of system deployment. Factors such as, but not limited to, the budget, capacity, location, and/or use of the underlying hardware resources may affect deployment requirements and configuration. Regardless of if the configuration results in more consolidated and/or integrated program components, results in a more distributed series of program components, and/or results in some combination between a consolidated and distributed configuration, data may be communicated, obtained, and/or provided. Instances of components consolidated into a common code base from the program component collection may communicate, obtain, and/or provide data. This may be accomplished through intra-application data processing communication techniques such as, but not limited to: data referencing (e.g., pointers), internal messaging, object instance variable communication, shared memory space, variable passing, and/or the like. For example, cloud services such as Amazon Data Services®, Microsoft Azure®, Hewlett Packard Helion®, IBM® Cloud services allow for MBR controller and/or MBR component collections to be hosted in full or partially for varying degrees of scale. 
     If component collection components are discrete, separate, and/or external to one another, then communicating, obtaining, and/or providing data with and/or to other component components may be accomplished through inter-application data processing communication techniques such as, but not limited to: Application Program Interfaces (API) information passage; (distributed) Component Object Model ((D)COM), (Distributed) Object Linking and Embedding ((D)OLE), and/or the like), Common Object Request Broker Architecture (CORBA), Jini local and remote application program interfaces, JavaScript Object Notation (JSON), Remote Method Invocation (RMI), SOAP, process pipes, shared files, and/or the like. Messages sent between discrete component components for inter-application communication or within memory spaces of a singular component for intra-application communication may be facilitated through the creation and parsing of a grammar A grammar may be developed by using development tools such as lex, yacc, XML, and/or the like, which allow for grammar generation and parsing capabilities, which in turn may form the basis of communication messages within and between components. 
     For example, a grammar may be arranged to recognize the tokens of an HTTP post command, e.g.:
         w3c -post http:// . . . Value1       

     where Value1 is discerned as being a parameter because “http://” is part of the grammar syntax, and what follows is considered part of the post value. Similarly, with such a grammar, a variable “Value1” may be inserted into an “http://” post command and then sent. The grammar syntax itself may be presented as structured data that is interpreted and/or otherwise used to generate the parsing mechanism (e.g., a syntax description text file as processed by lex, yacc, etc.). Also, once the parsing mechanism is generated and/or instantiated, it itself may process and/or parse structured data such as, but not limited to: character (e.g., tab) delineated text, HTML, structured text streams, XML, and/or the like structured data. In another embodiment, inter-application data processing protocols themselves may have integrated parsers (e.g., JSON, SOAP, and/or like parsers) that may be employed to parse (e.g., communications) data. Further, the parsing grammar may be used beyond message parsing, but may also be used to parse: databases, data collections, data stores, structured data, and/or the like. Again, the desired configuration will depend upon the context, environment, and requirements of system deployment. 
     For example, in some implementations, the MBR controller may be executing a PHP script implementing a Secure Sockets Layer (“SSL”) socket server via the information server, which listens to incoming communications on a server port to which a client may send data, e.g., data encoded in JSON format. Upon identifying an incoming communication, the PHP script may read the incoming message from the client device, parse the received JSON-encoded text data to extract information from the JSON-encoded text data into PHP script variables, and store the data (e.g., client identifying information, etc.) and/or extracted information in a relational database accessible using the Structured Query Language (“SQL”). An exemplary listing, written substantially in the form of PHP/SQL commands, to accept JSON-encoded input data from a client device via a SSL connection, parse the data to extract variables, and store the data to a database, is provided below: 
     
       
         
           
               
             
               
                   
               
             
            
               
                 &lt;?PHP 
               
               
                 header(‘Content-Type: text/plain’); 
               
               
                 // set ip address and port to listen to for incoming data 
               
               
                 $address = ‘192.168.0.100’; 
               
               
                 $port = 255; 
               
               
                 // create a server-side SSL socket, listen for/accept incoming 
               
               
                 communication 
               
               
                 $sock = socket_create(AF_INET, SOCK_STREAM, 0); 
               
               
                 socket_bind($sock, $address, $port) or die(‘Could not bind to address’); 
               
               
                 socket_listen($sock); 
               
               
                 $client = socket_accept($sock); 
               
               
                 // read input data from client device in 1024 byte blocks until end of 
               
               
                 message do { 
               
               
                   $input = “”; 
               
               
                   $input = socket_read($client, 1024); 
               
               
                   $data .= $input; 
               
               
                 } while($input != “”); 
               
               
                 // parse data to extract variables 
               
               
                 $obj = json_decode($data, true); 
               
               
                 // store input data in a database 
               
               
                 mysql_connect(″201.408.185.132″,$DBserver,$password); // access 
               
               
                 database server 
               
               
                 mysql_select(″CLIENT_DB.SQL″); // select database to append 
               
               
                 mysql_query(“INSERT INTO UserTable (transmission) 
               
               
                 VALUES ($data)”); // add data to UserTable table in a CLIENT database 
               
               
                 mysql_close(″CLIENT_DB.SQL″); // close connection to database 
               
               
                 ?&gt; 
               
               
                   
               
            
           
         
       
     
     Also, the following resources may be used to provide example embodiments regarding SOAP parser implementation:
         http://www.xay.com/perl/site/lib/SOAP/Parser.html   http://publib.boulder.ibm.com/infocenter/tivihelp/v2r1/index.jsp?topic=/com.ibm.IBMDI.doc/referenceguide295.htm
 
and other parser implementations:
   http://publib.boulder.ibm.com/infocenter/tivihelp/v2r1/index.jsp?topic=/com.ibm.IBMDI.doc/referenceguide259.htm
 
all of which are hereby expressly incorporated by reference.
       

     Additional embodiments may include:
     1. A backup apparatus, comprising:   a memory;   a component collection in the memory, including:
       a backup processing component, and   a finalization settings determining component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the backup processing component, stored in the memory, to:
           (a) designate, via at least one processor, a set of one or more blocks to be copied from a source volume to a target volume;   (b) copy, via at least one processor, the designated set of one or more blocks from the source volume to the target volume while an operating system is configured to write to the source volume;   (c) identify, via at least one processor, blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during element (b);   (d) analyze, via at least one processor, finalization settings to determine whether to enter a copy-on-write mode, when one or more blocks were identified in element (c);
               (d)(i) change, via at least one processor, the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks and repeat elements (b), (c), and (d), when it is determined that the copy-on-write mode should not be entered;   (d)(ii) instruct, via at least one processor, the operating system to enter the copy-on-write mode and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered, when it is determined that the copy-on-write mode should be entered;   
               
           wherein the processor issues instructions from the finalization settings determining component, stored in the memory, to:
           obtain, via at least one processor, a finalization settings request from the backup processing component; and   provide, via at least one processor, the finalization settings to the backup processing component.   
           
       2. The apparatus of embodiment 1, wherein the copy-on-write mode is a mode in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block.   3. The apparatus of embodiment 1, further, comprising:
       the processor issues instructions from the backup processing component, stored in the memory, to:
           log, via at least one processor, backup performance characteristics.   
           
       4. The apparatus of embodiment 3, wherein the backup performance characteristics include: number of passes through elements (b), (c), and (d) until the copy-on-write mode is entered, amount of data stored in each pass, completion time for each pass.   5. The apparatus of embodiment 1, further, comprising:
       the processor issues instructions from the finalization settings determining component, stored in the memory, to:
           determine, via at least one processor, finalization configuration settings associated with the finalization settings request, wherein the finalization configuration settings specify a set of metrics utilized to determine whether to enter the copy-on-write mode, and a threshold value, for each metric in the set of metrics, that indicates whether a metric has been satisfied.   
           
       6. The apparatus of embodiment 5, wherein a threshold value is specified as a constant.   7. The apparatus of embodiment 5, wherein a threshold value is specified as a function or calculated parameter.   8. The apparatus of embodiment 7, further, comprising:
       the processor issues instructions from the finalization settings determining component, stored in the memory, to:
           determine, via at least one processor, a usage profile associated with the finalization settings request;   retrieve, via at least one processor, performance logs associated with the usage profile for the threshold value specified as a function or calculated parameter; and   evaluate, via at least one processor, the threshold value specified as a function or calculated parameter using the retrieved performance logs.   
           
       9. The apparatus of embodiment 5, wherein the finalization configuration settings further include a set of logical operators that specify how to evaluate a combination of metrics in the set of metrics to determine whether the finalization settings have been satisfied.   10. The apparatus of embodiment 5, wherein the set of metrics includes a block size metric that is satisfied when aggregate size of changed blocks in a pass through elements (b), (c), and (d) crosses a threshold value that is dynamically calculated based on either available bandwidth between the source volume and the target volume, or size of at least one of: the source volume or the target volume.   11. The apparatus of embodiment 5, wherein the set of metrics includes a number of passes metric that is satisfied when the number of passes through elements (b), (c), and (d) crosses a threshold value specified as a dynamic number calculated based on the average number of passes for a usage profile associated with the finalization settings request.   12. The apparatus of embodiment 5, wherein the set of metrics includes a delta data metric that is satisfied when the change in the amount of data copied between passes through elements (b), (c), and (d) reaches an asymptote.   13. The apparatus of embodiment 5, wherein the set of metrics includes a delta time metric that is satisfied when the change between passes through elements (b), (c), and (d) in the amount of time to complete a pass crosses a threshold value.   14. The apparatus of embodiment 5, wherein the set of metrics includes a pass completion time metric that is satisfied when pass completion time for pass through elements (b), (c), and (d) crosses a threshold value specified as a constant.   15. The apparatus of embodiment 5, wherein the set of metrics includes a resource intensity metric that is satisfied when resource load for pass through elements (b), (c), and (d) crosses a threshold value, wherein the resource load includes at least one of: processor utilization, disk utilization, network utilization, power utilization.   16. A processor-readable backup non-transient physical medium storing processor-executable components, the components, comprising:   a component collection stored in the medium, including:
       a backup processing component, and   a finalization settings determining component;   wherein the backup processing component, stored in the medium, includes processor-issuable instructions to:
           (a) designate, via at least one processor, a set of one or more blocks to be copied from a source volume to a target volume;   (b) copy, via at least one processor, the designated set of one or more blocks from the source volume to the target volume while an operating system is configured to write to the source volume;   (c) identify, via at least one processor, blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during element (b);   (d) analyze, via at least one processor, finalization settings to determine whether to enter a copy-on-write mode, when one or more blocks were identified in element (c);
               (d)(i) change, via at least one processor, the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks and repeat elements (b), (c), and (d), when it is determined that the copy-on-write mode should not be entered;   (d)(ii) instruct, via at least one processor, the operating system to enter the copy-on-write mode and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered, when it is determined that the copy-on-write mode should be entered;   
               
           wherein the finalization settings determining component, stored in the medium, includes processor-issuable instructions to:
           obtain, via at least one processor, a finalization settings request from the backup processing component; and   provide, via at least one processor, the finalization settings to the backup processing component.   
           
       17. The medium of embodiment 16, wherein the copy-on-write mode is a mode in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block.   18. The medium of embodiment 16, further, comprising:
       the backup processing component, stored in the medium, includes processor-issuable instructions to:
           log, via at least one processor, backup performance characteristics.   
           
       19. The medium of embodiment 18, wherein the backup performance characteristics include: number of passes through elements (b), (c), and (d) until the copy-on-write mode is entered, amount of data stored in each pass, completion time for each pass.   20. The medium of embodiment 16, further, comprising:
       the finalization settings determining component, stored in the medium, includes processor-issuable instructions to:
           determine, via at least one processor, finalization configuration settings associated with the finalization settings request, wherein the finalization configuration settings specify a set of metrics utilized to determine whether to enter the copy-on-write mode, and a threshold value, for each metric in the set of metrics, that indicates whether a metric has been satisfied.   
           
       21. The medium of embodiment 20, wherein a threshold value is specified as a constant.   22. The medium of embodiment 20, wherein a threshold value is specified as a function or calculated parameter.   23. The medium of embodiment 22, further, comprising:
       the finalization settings determining component, stored in the medium, includes processor-issuable instructions to:
           determine, via at least one processor, a usage profile associated with the finalization settings request;   retrieve, via at least one processor, performance logs associated with the usage profile for the threshold value specified as a function or calculated parameter; and   evaluate, via at least one processor, the threshold value specified as a function or calculated parameter using the retrieved performance logs.   
           
       24. The medium of embodiment 20, wherein the finalization configuration settings further include a set of logical operators that specify how to evaluate a combination of metrics in the set of metrics to determine whether the finalization settings have been satisfied.   25. The medium of embodiment 20, wherein the set of metrics includes a block size metric that is satisfied when aggregate size of changed blocks in a pass through elements (b), (c), and (d) crosses a threshold value that is dynamically calculated based on either available bandwidth between the source volume and the target volume, or size of at least one of: the source volume or the target volume.   26. The medium of embodiment 20, wherein the set of metrics includes a number of passes metric that is satisfied when the number of passes through elements (b), (c), and (d) crosses a threshold value specified as a dynamic number calculated based on the average number of passes for a usage profile associated with the finalization settings request.   27. The medium of embodiment 20, wherein the set of metrics includes a delta data metric that is satisfied when the change in the amount of data copied between passes through elements (b), (c), and (d) reaches an asymptote.   28. The medium of embodiment 20, wherein the set of metrics includes a delta time metric that is satisfied when the change between passes through elements (b), (c), and (d) in the amount of time to complete a pass crosses a threshold value.   29. The medium of embodiment 20, wherein the set of metrics includes a pass completion time metric that is satisfied when pass completion time for pass through elements (b), (c), and (d) crosses a threshold value specified as a constant.   30. The medium of embodiment 20, wherein the set of metrics includes a resource intensity metric that is satisfied when resource load for pass through elements (b), (c), and (d) crosses a threshold value, wherein the resource load includes at least one of: processor utilization, disk utilization, network utilization, power utilization.   31. A processor-implemented backup system, comprising:
       a backup processing component means, to:
           (a) designate, via at least one processor, a set of one or more blocks to be copied from a source volume to a target volume;   (b) copy, via at least one processor, the designated set of one or more blocks from the source volume to the target volume while an operating system is configured to write to the source volume;   (c) identify, via at least one processor, blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during element (b);   (d) analyze, via at least one processor, finalization settings to determine whether to enter a copy-on-write mode, when one or more blocks were identified in element (c);
               (d)(i) change, via at least one processor, the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks and repeat elements (b), (c), and (d), when it is determined that the copy-on-write mode should not be entered;   (d)(ii) instruct, via at least one processor, the operating system to enter the copy-on-write mode and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered, when it is determined that the copy-on-write mode should be entered;   
               
           a finalization settings determining component means, to:
           obtain, via at least one processor, a finalization settings request from the backup processing component; and   provide, via at least one processor, the finalization settings to the backup processing component.   
           
       32. The system of embodiment 31, wherein the copy-on-write mode is a mode in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block.   33. The system of embodiment 31, further, comprising:
       the backup processing component means, to:
           log, via at least one processor, backup performance characteristics.   
           
       34. The system of embodiment 33, wherein the backup performance characteristics include: number of passes through elements (b), (c), and (d) until the copy-on-write mode is entered, amount of data stored in each pass, completion time for each pass.   35. The system of embodiment 31, further, comprising:
       the finalization settings determining component means, to:
           determine, via at least one processor, finalization configuration settings associated with the finalization settings request, wherein the finalization configuration settings specify a set of metrics utilized to determine whether to enter the copy-on-write mode, and a threshold value, for each metric in the set of metrics, that indicates whether a metric has been satisfied.   
           
       36. The system of embodiment 35, wherein a threshold value is specified as a constant.   37. The system of embodiment 35, wherein a threshold value is specified as a function or calculated parameter.   38. The system of embodiment 37, further, comprising:
       the finalization settings determining component means, to:
           determine, via at least one processor, a usage profile associated with the finalization settings request;   retrieve, via at least one processor, performance logs associated with the usage profile for the threshold value specified as a function or calculated parameter; and   evaluate, via at least one processor, the threshold value specified as a function or calculated parameter using the retrieved performance logs.   
           
       39. The system of embodiment 35, wherein the finalization configuration settings further include a set of logical operators that specify how to evaluate a combination of metrics in the set of metrics to determine whether the finalization settings have been satisfied.   40. The system of embodiment 35, wherein the set of metrics includes a block size metric that is satisfied when aggregate size of changed blocks in a pass through elements (b), (c), and (d) crosses a threshold value that is dynamically calculated based on either available bandwidth between the source volume and the target volume, or size of at least one of: the source volume or the target volume.   41. The system of embodiment 35, wherein the set of metrics includes a number of passes metric that is satisfied when the number of passes through elements (b), (c), and (d) crosses a threshold value specified as a dynamic number calculated based on the average number of passes for a usage profile associated with the finalization settings request.   42. The system of embodiment 35, wherein the set of metrics includes a delta data metric that is satisfied when the change in the amount of data copied between passes through elements (b), (c), and (d) reaches an asymptote.   43. The system of embodiment 35, wherein the set of metrics includes a delta time metric that is satisfied when the change between passes through elements (b), (c), and (d) in the amount of time to complete a pass crosses a threshold value.   44. The system of embodiment 35, wherein the set of metrics includes a pass completion time metric that is satisfied when pass completion time for pass through elements (b), (c), and (d) crosses a threshold value specified as a constant.   45. The system of embodiment 35, wherein the set of metrics includes a resource intensity metric that is satisfied when resource load for pass through elements (b), (c), and (d) crosses a threshold value, wherein the resource load includes at least one of: processor utilization, disk utilization, network utilization, power utilization.   46. A processor-implemented backup method, comprising:
       executing processor-implemented backup processing component instructions to:
           (a) designate, via at least one processor, a set of one or more blocks to be copied from a source volume to a target volume;   (b) copy, via at least one processor, the designated set of one or more blocks from the source volume to the target volume while an operating system is configured to write to the source volume;   (c) identify, via at least one processor, blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during element (b);   (d) analyze, via at least one processor, finalization settings to determine whether to enter a copy-on-write mode, when one or more blocks were identified in element (c);
               (d)(i) change, via at least one processor, the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks and repeat elements (b), (c), and (d), when it is determined that the copy-on-write mode should not be entered;   (d)(ii) instruct, via at least one processor, the operating system to enter the copy-on-write mode and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered, when it is determined that the copy-on-write mode should be entered;   
               
           executing processor-implemented finalization settings determining component instructions to:
           obtain, via at least one processor, a finalization settings request from the backup processing component; and   provide, via at least one processor, the finalization settings to the backup processing component.   
           
       47. The method of embodiment 46, wherein the copy-on-write mode is a mode in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block.   48. The method of embodiment 46, further, comprising:
       executing processor-implemented backup processing component instructions to:
           log, via at least one processor, backup performance characteristics.   
           
       49. The method of embodiment 48, wherein the backup performance characteristics include: number of passes through elements (b), (c), and (d) until the copy-on-write mode is entered, amount of data stored in each pass, completion time for each pass.   50. The method of embodiment 46, further, comprising:
       executing processor-implemented finalization settings determining component instructions to:
           determine, via at least one processor, finalization configuration settings associated with the finalization settings request, wherein the finalization configuration settings specify a set of metrics utilized to determine whether to enter the copy-on-write mode, and a threshold value, for each metric in the set of metrics, that indicates whether a metric has been satisfied.   
           
       51. The method of embodiment 50, wherein a threshold value is specified as a constant.   52. The method of embodiment 50, wherein a threshold value is specified as a function or calculated parameter.   53. The method of embodiment 52, further, comprising:
       executing processor-implemented finalization settings determining component instructions to:
           determine, via at least one processor, a usage profile associated with the finalization settings request;   retrieve, via at least one processor, performance logs associated with the usage profile for the threshold value specified as a function or calculated parameter; and   evaluate, via at least one processor, the threshold value specified as a function or calculated parameter using the retrieved performance logs.   
           
       54. The method of embodiment 50, wherein the finalization configuration settings further include a set of logical operators that specify how to evaluate a combination of metrics in the set of metrics to determine whether the finalization settings have been satisfied.   55. The method of embodiment 50, wherein the set of metrics includes a block size metric that is satisfied when aggregate size of changed blocks in a pass through elements (b), (c), and (d) crosses a threshold value that is dynamically calculated based on either available bandwidth between the source volume and the target volume, or size of at least one of: the source volume or the target volume.   56. The method of embodiment 50, wherein the set of metrics includes a number of passes metric that is satisfied when the number of passes through elements (b), (c), and (d) crosses a threshold value specified as a dynamic number calculated based on the average number of passes for a usage profile associated with the finalization settings request.   57. The method of embodiment 50, wherein the set of metrics includes a delta data metric that is satisfied when the change in the amount of data copied between passes through elements (b), (c), and (d) reaches an asymptote.   58. The method of embodiment 50, wherein the set of metrics includes a delta time metric that is satisfied when the change between passes through elements (b), (c), and (d) in the amount of time to complete a pass crosses a threshold value.   59. The method of embodiment 50, wherein the set of metrics includes a pass completion time metric that is satisfied when pass completion time for pass through elements (b), (c), and (d) crosses a threshold value specified as a constant.   60. The method of embodiment 50, wherein the set of metrics includes a resource intensity metric that is satisfied when resource load for pass through elements (b), (c), and (d) crosses a threshold value, wherein the resource load includes at least one of: processor utilization, disk utilization, network utilization, power utilization.   101. A backup apparatus, comprising:   a memory;   a component collection in the memory, including:
       a backup processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the backup processing component, stored in the memory, to:
           (a) designate, via at least one processor, a set of one or more blocks to be copied from a source volume to a target volume based on predictive optimization settings associated with a backup request;   (b) copy, via at least one processor, at least some of the designated set of one or more blocks from the source volume to the target volume based on lookahead optimization settings associated with the backup request, while an operating system is configured to write to the source volume;   (c) identify, via at least one processor, blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during element (b);   (d) determine, via at least one processor, whether to enter a copy-on-write mode, when one or more blocks were identified in element (c);
               (d)(i) change, via at least one processor, the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks based on the predictive optimization settings and repeat elements (b), (c), and (d), when it is determined that the copy-on-write mode should not be entered;   (d)(ii) instruct, via at least one processor, the operating system to enter the copy-on-write mode and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered, when it is determined that the copy-on-write mode should be entered.   
               
           
       102. The apparatus of embodiment 101, further, comprising:
       the processor issues instructions from the backup processing component, stored in the memory, to:
           determine, via at least one processor, a usage profile associated with the backup request; and   set, via at least one processor, the predictive optimization settings to settings corresponding to the usage profile.   
           
       103. The apparatus of embodiment 102, further, comprising:
       the processor issues instructions from the backup processing component, stored in the memory, to:
           retrieve, via at least one processor, performance logs associated with the usage profile; and   determine, via at least one processor, an optimal predictive optimization settings combination based on analysis of the performance logs via a machine learning technique,
               wherein the predictive optimization settings are set to the optimal predictive optimization settings combination.   
               
           
       104. The apparatus of embodiment 101, wherein the predictive optimization settings specify that stable blocks criteria, which identify blocks on the source volume that are unlikely to change, are utilized to designate the set of one or more blocks to be copied.   105. The apparatus of embodiment 104, wherein stable blocks optimization settings specify a set of blocks classified as stable blocks, and wherein blocks other than the stable blocks are not designated in the set of one or more blocks to be copied for a specified number of passes through elements (b), (c), and (d).   106. The apparatus of embodiment 105, wherein the stable blocks include blocks that represent at least one of: the operating system, applications, user data.   107. The apparatus of embodiment 105, wherein the stable blocks include blocks classified as stable based on analysis of write history associated with blocks on the source volume via a machine learning technique.   108. The apparatus of embodiment 101, wherein the predictive optimization settings specify that busy blocks criteria, which identify blocks on the source volume that are likely to change frequently, are utilized to designate the set of one or more blocks to be copied.   109. The apparatus of embodiment 108, wherein busy blocks optimization settings specify a set of blocks classified as busy blocks, and wherein the busy blocks are not designated in the set of one or more blocks to be copied for a specified number of passes through elements (b), (c), and (d).   110. The apparatus of embodiment 109, wherein the busy blocks include blocks that represent at least one of: database entries, mail server files.   111. The apparatus of embodiment 109, wherein the busy blocks include blocks classified as busy based on analysis of write history associated with blocks on the source volume via a statistical technique.   112. The apparatus of embodiment 101, wherein the predictive optimization settings specify that historical change frequency criteria, which categorize blocks on the source volume into different frequency types based on analysis of write history, are utilized to designate the set of one or more blocks to be copied.   113. The apparatus of embodiment 112, wherein historical change frequency optimization settings specify the number of passes through elements (b), (c), and (d) during which blocks of each frequency type are not designated in the set of one or more blocks to be copied.   114. The apparatus of embodiment 101, further, comprising:
       the processor issues instructions from the backup processing component, stored in the memory, to:
           determine, via at least one processor, a usage profile associated with the backup request; and   set, via at least one processor, the lookahead optimization settings to settings corresponding to the usage profile.   
           
       115. The apparatus of embodiment 114, further, comprising:
       the processor issues instructions from the backup processing component, stored in the memory, to:
           retrieve, via at least one processor, performance logs associated with the usage profile; and   determine, via at least one processor, an optimal lookahead optimization settings combination based on analysis of the performance logs via a statistical technique,
               wherein the lookahead optimization settings are set to the optimal lookahead optimization settings combination.   
               
           
       116. The apparatus of embodiment 101, wherein the lookahead optimization settings specify that accelerated copy optimization is utilized to configure copying of the designated set of one or more blocks.   117. The apparatus of embodiment 116, wherein accelerated copy optimization settings specify that blocks on the source volume that changed forward of a current position and that had not been marked as changed blocks at the start of a current pass through elements (b), (c), and (d) are added to the set of one or more blocks to copy.   118. The apparatus of embodiment 117, wherein the accelerated copy optimization settings specify a schedule that determines when the accelerated copy optimization is utilized.   119. The apparatus of embodiment 101, wherein the lookahead optimization settings specify that delayed copy optimization is utilized to configure copying of the designated set of one or more blocks.   120. The apparatus of embodiment 119, wherein delayed copy optimization settings specify that blocks on the source volume that changed forward of a current position and that had been marked as changed blocks at the start of a current pass through elements (b), (c), and (d) are removed from the set of one or more blocks to copy.   121. A processor-readable backup non-transient physical medium storing processor-executable components, the components, comprising:   a component collection stored in the medium, including:
       a backup processing component;   wherein the backup processing component, stored in the medium, includes processor-issuable instructions to:
           (a) designate, via at least one processor, a set of one or more blocks to be copied from a source volume to a target volume based on predictive optimization settings associated with a backup request;   (b) copy, via at least one processor, at least some of the designated set of one or more blocks from the source volume to the target volume based on lookahead optimization settings associated with the backup request, while an operating system is configured to write to the source volume;   (c) identify, via at least one processor, blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during element (b);   (d) determine, via at least one processor, whether to enter a copy-on-write mode, when one or more blocks were identified in element (c);
               (d)(i) change, via at least one processor, the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks based on the predictive optimization settings and repeat elements (b), (c), and (d), when it is determined that the copy-on-write mode should not be entered;   (d)(ii) instruct, via at least one processor, the operating system to enter the copy-on-write mode and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered, when it is determined that the copy-on-write mode should be entered.   
               
           
       122. The medium of embodiment 121, further, comprising:
       the backup processing component, stored in the medium, includes processor-issuable instructions to:
           determine, via at least one processor, a usage profile associated with the backup request; and   set, via at least one processor, the predictive optimization settings to settings corresponding to the usage profile.   
           
       123. The medium of embodiment 122, further, comprising:
       the backup processing component, stored in the medium, includes processor-issuable instructions to:
           retrieve, via at least one processor, performance logs associated with the usage profile; and   determine, via at least one processor, an optimal predictive optimization settings combination based on analysis of the performance logs via a machine learning technique,
               wherein the predictive optimization settings are set to the optimal predictive optimization settings combination.   
               
           
       124. The medium of embodiment 121, wherein the predictive optimization settings specify that stable blocks criteria, which identify blocks on the source volume that are unlikely to change, are utilized to designate the set of one or more blocks to be copied.   125. The medium of embodiment 124, wherein stable blocks optimization settings specify a set of blocks classified as stable blocks, and wherein blocks other than the stable blocks are not designated in the set of one or more blocks to be copied for a specified number of passes through elements (b), (c), and (d).   126. The medium of embodiment 125, wherein the stable blocks include blocks that represent at least one of: the operating system, applications, user data.   127. The medium of embodiment 125, wherein the stable blocks include blocks classified as stable based on analysis of write history associated with blocks on the source volume via a machine learning technique.   128. The medium of embodiment 121, wherein the predictive optimization settings specify that busy blocks criteria, which identify blocks on the source volume that are likely to change frequently, are utilized to designate the set of one or more blocks to be copied.   129. The medium of embodiment 128, wherein busy blocks optimization settings specify a set of blocks classified as busy blocks, and wherein the busy blocks are not designated in the set of one or more blocks to be copied for a specified number of passes through elements (b), (c), and (d).   130. The medium of embodiment 129, wherein the busy blocks include blocks that represent at least one of: database entries, mail server files.   131. The medium of embodiment 129, wherein the busy blocks include blocks classified as busy based on analysis of write history associated with blocks on the source volume via a statistical technique.   132. The medium of embodiment 121, wherein the predictive optimization settings specify that historical change frequency criteria, which categorize blocks on the source volume into different frequency types based on analysis of write history, are utilized to designate the set of one or more blocks to be copied.   133. The medium of embodiment 132, wherein historical change frequency optimization settings specify the number of passes through elements (b), (c), and (d) during which blocks of each frequency type are not designated in the set of one or more blocks to be copied.   134. The medium of embodiment 121, further, comprising:
       the backup processing component, stored in the medium, includes processor-issuable instructions to:
           determine, via at least one processor, a usage profile associated with the backup request; and   set, via at least one processor, the lookahead optimization settings to settings corresponding to the usage profile.   
           
       135. The medium of embodiment 134, further, comprising:
       the backup processing component, stored in the medium, includes processor-issuable instructions to:
           retrieve, via at least one processor, performance logs associated with the usage profile; and   determine, via at least one processor, an optimal lookahead optimization settings combination based on analysis of the performance logs via a statistical technique,
               wherein the lookahead optimization settings are set to the optimal lookahead optimization settings combination.   
               
           
       136. The medium of embodiment 121, wherein the lookahead optimization settings specify that accelerated copy optimization is utilized to configure copying of the designated set of one or more blocks.   137. The medium of embodiment 136, wherein accelerated copy optimization settings specify that blocks on the source volume that changed forward of a current position and that had not been marked as changed blocks at the start of a current pass through elements (b), (c), and (d) are added to the set of one or more blocks to copy.   138. The medium of embodiment 137, wherein the accelerated copy optimization settings specify a schedule that determines when the accelerated copy optimization is utilized.   139. The medium of embodiment 121, wherein the lookahead optimization settings specify that delayed copy optimization is utilized to configure copying of the designated set of one or more blocks.   140. The medium of embodiment 139, wherein delayed copy optimization settings specify that blocks on the source volume that changed forward of a current position and that had been marked as changed blocks at the start of a current pass through elements (b), (c), and (d) are removed from the set of one or more blocks to copy.   141. A processor-implemented backup system, comprising:
       a backup processing component means, to:
           (a) designate, via at least one processor, a set of one or more blocks to be copied from a source volume to a target volume based on predictive optimization settings associated with a backup request;   (b) copy, via at least one processor, at least some of the designated set of one or more blocks from the source volume to the target volume based on lookahead optimization settings associated with the backup request, while an operating system is configured to write to the source volume;   (c) identify, via at least one processor, blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during element (b);   (d) determine, via at least one processor, whether to enter a copy-on-write mode, when one or more blocks were identified in element (c);
               (d)(i) change, via at least one processor, the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks based on the predictive optimization settings and repeat elements (b), (c), and (d), when it is determined that the copy-on-write mode should not be entered;   (d)(ii) instruct, via at least one processor, the operating system to enter the copy-on-write mode and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered, when it is determined that the copy-on-write mode should be entered.   
               
           
       142. The system of embodiment 141, further, comprising:
       the backup processing component means, to:
           determine, via at least one processor, a usage profile associated with the backup request; and   set, via at least one processor, the predictive optimization settings to settings corresponding to the usage profile.   
           
       143. The system of embodiment 142, further, comprising:
       the backup processing component means, to:
           retrieve, via at least one processor, performance logs associated with the usage profile; and   determine, via at least one processor, an optimal predictive optimization settings combination based on analysis of the performance logs via a machine learning technique,
               wherein the predictive optimization settings are set to the optimal predictive optimization settings combination.   
               
           
       144. The system of embodiment 141, wherein the predictive optimization settings specify that stable blocks criteria, which identify blocks on the source volume that are unlikely to change, are utilized to designate the set of one or more blocks to be copied.   145. The system of embodiment 144, wherein stable blocks optimization settings specify a set of blocks classified as stable blocks, and wherein blocks other than the stable blocks are not designated in the set of one or more blocks to be copied for a specified number of passes through elements (b), (c), and (d).   146. The system of embodiment 145, wherein the stable blocks include blocks that represent at least one of: the operating system, applications, user data.   147. The system of embodiment 145, wherein the stable blocks include blocks classified as stable based on analysis of write history associated with blocks on the source volume via a machine learning technique.   148. The system of embodiment 141, wherein the predictive optimization settings specify that busy blocks criteria, which identify blocks on the source volume that are likely to change frequently, are utilized to designate the set of one or more blocks to be copied.   149. The system of embodiment 148, wherein busy blocks optimization settings specify a set of blocks classified as busy blocks, and wherein the busy blocks are not designated in the set of one or more blocks to be copied for a specified number of passes through elements (b), (c), and (d).   150. The system of embodiment 149, wherein the busy blocks include blocks that represent at least one of: database entries, mail server files.   151. The system of embodiment 149, wherein the busy blocks include blocks classified as busy based on analysis of write history associated with blocks on the source volume via a statistical technique.   152. The system of embodiment 141, wherein the predictive optimization settings specify that historical change frequency criteria, which categorize blocks on the source volume into different frequency types based on analysis of write history, are utilized to designate the set of one or more blocks to be copied.   153. The system of embodiment 152, wherein historical change frequency optimization settings specify the number of passes through elements (b), (c), and (d) during which blocks of each frequency type are not designated in the set of one or more blocks to be copied.   154. The system of embodiment 141, further, comprising:
       the backup processing component means, to:
           determine, via at least one processor, a usage profile associated with the backup request; and   set, via at least one processor, the lookahead optimization settings to settings corresponding to the usage profile.   
           
       155. The system of embodiment 154, further, comprising:
       the backup processing component means, to:
           retrieve, via at least one processor, performance logs associated with the usage profile; and   determine, via at least one processor, an optimal lookahead optimization settings combination based on analysis of the performance logs via a statistical technique,
               wherein the lookahead optimization settings are set to the optimal lookahead optimization settings combination.   
               
           
       156. The system of embodiment 141, wherein the lookahead optimization settings specify that accelerated copy optimization is utilized to configure copying of the designated set of one or more blocks.   157. The system of embodiment 156, wherein accelerated copy optimization settings specify that blocks on the source volume that changed forward of a current position and that had not been marked as changed blocks at the start of a current pass through elements (b), (c), and (d) are added to the set of one or more blocks to copy.   158. The system of embodiment 157, wherein the accelerated copy optimization settings specify a schedule that determines when the accelerated copy optimization is utilized.   159. The system of embodiment 141, wherein the lookahead optimization settings specify that delayed copy optimization is utilized to configure copying of the designated set of one or more blocks.   160. The system of embodiment 159, wherein delayed copy optimization settings specify that blocks on the source volume that changed forward of a current position and that had been marked as changed blocks at the start of a current pass through elements (b), (c), and (d) are removed from the set of one or more blocks to copy.   161. A processor-implemented backup method, comprising:
       executing processor-implemented backup processing component instructions to:
           (a) designate, via at least one processor, a set of one or more blocks to be copied from a source volume to a target volume based on predictive optimization settings associated with a backup request;   (b) copy, via at least one processor, at least some of the designated set of one or more blocks from the source volume to the target volume based on lookahead optimization settings associated with the backup request, while an operating system is configured to write to the source volume;   (c) identify, via at least one processor, blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during element (b);   (d) determine, via at least one processor, whether to enter a copy-on-write mode, when one or more blocks were identified in element (c);
               (d)(i) change, via at least one processor, the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks based on the predictive optimization settings and repeat elements (b), (c), and (d), when it is determined that the copy-on-write mode should not be entered;   (d)(ii) instruct, via at least one processor, the operating system to enter the copy-on-write mode and bring the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered, when it is determined that the copy-on-write mode should be entered.   
               
           
       162. The method of embodiment 161, further, comprising:
       executing processor-implemented backup processing component instructions to:
           determine, via at least one processor, a usage profile associated with the backup request; and   set, via at least one processor, the predictive optimization settings to settings corresponding to the usage profile.   
           
       163. The method of embodiment 162, further, comprising:
       executing processor-implemented backup processing component instructions to:
           retrieve, via at least one processor, performance logs associated with the usage profile; and   determine, via at least one processor, an optimal predictive optimization settings combination based on analysis of the performance logs via a machine learning technique,
               wherein the predictive optimization settings are set to the optimal predictive optimization settings combination.   
               
           
       164. The method of embodiment 161, wherein the predictive optimization settings specify that stable blocks criteria, which identify blocks on the source volume that are unlikely to change, are utilized to designate the set of one or more blocks to be copied.   165. The method of embodiment 164, wherein stable blocks optimization settings specify a set of blocks classified as stable blocks, and wherein blocks other than the stable blocks are not designated in the set of one or more blocks to be copied for a specified number of passes through elements (b), (c), and (d).   166. The method of embodiment 165, wherein the stable blocks include blocks that represent at least one of: the operating system, applications, user data.   167. The method of embodiment 165, wherein the stable blocks include blocks classified as stable based on analysis of write history associated with blocks on the source volume via a machine learning technique.   168. The method of embodiment 161, wherein the predictive optimization settings specify that busy blocks criteria, which identify blocks on the source volume that are likely to change frequently, are utilized to designate the set of one or more blocks to be copied.   169. The method of embodiment 168, wherein busy blocks optimization settings specify a set of blocks classified as busy blocks, and wherein the busy blocks are not designated in the set of one or more blocks to be copied for a specified number of passes through elements (b), (c), and (d).   170. The method of embodiment 169, wherein the busy blocks include blocks that represent at least one of: database entries, mail server files.   171. The method of embodiment 169, wherein the busy blocks include blocks classified as busy based on analysis of write history associated with blocks on the source volume via a statistical technique.   172. The method of embodiment 161, wherein the predictive optimization settings specify that historical change frequency criteria, which categorize blocks on the source volume into different frequency types based on analysis of write history, are utilized to designate the set of one or more blocks to be copied.   173. The method of embodiment 172, wherein historical change frequency optimization settings specify the number of passes through elements (b), (c), and (d) during which blocks of each frequency type are not designated in the set of one or more blocks to be copied.   174. The method of embodiment 161, further, comprising:
       executing processor-implemented backup processing component instructions to:
           determine, via at least one processor, a usage profile associated with the backup request; and   set, via at least one processor, the lookahead optimization settings to settings corresponding to the usage profile.   
           
       175. The method of embodiment 174, further, comprising:
       executing processor-implemented backup processing component instructions to:
           retrieve, via at least one processor, performance logs associated with the usage profile; and   determine, via at least one processor, an optimal lookahead optimization settings combination based on analysis of the performance logs via a statistical technique,
               wherein the lookahead optimization settings are set to the optimal lookahead optimization settings combination.   
               
           
       176. The method of embodiment 161, wherein the lookahead optimization settings specify that accelerated copy optimization is utilized to configure copying of the designated set of one or more blocks.   177. The method of embodiment 176, wherein accelerated copy optimization settings specify that blocks on the source volume that changed forward of a current position and that had not been marked as changed blocks at the start of a current pass through elements (b), (c), and (d) are added to the set of one or more blocks to copy.   178. The method of embodiment 177, wherein the accelerated copy optimization settings specify a schedule that determines when the accelerated copy optimization is utilized.   179. The method of embodiment 161, wherein the lookahead optimization settings specify that delayed copy optimization is utilized to configure copying of the designated set of one or more blocks.   180. The method of embodiment 179, wherein delayed copy optimization settings specify that blocks on the source volume that changed forward of a current position and that had been marked as changed blocks at the start of a current pass through elements (b), (c), and (d) are removed from the set of one or more blocks to copy.   201. A method for copying a source volume comprising multiple blocks to a target volume while an operating system is configured to write to the source volume, the method comprising:   (a) designating a set of one or more blocks to be copied from the source volume to the target volume;   (b) copying the designated set of one or more blocks from the source volume to the target volume while the operating system is configured to write to the source volume;   (c) identifying blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during step (b);   (d) if one or more blocks were identified in step (c), comparing an aggregate size of the identified one or more blocks to a threshold, wherein:
       (d) (i) if the aggregate size is greater than or equal to the threshold:
           changing the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks, and   repeating steps (b), (c), and (d);   
           (d)(ii) if the aggregate size is below the threshold:
           causing the operating system to enter a copy-on-write mode, in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block, and   bringing the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered.   
           
       202. The method of embodiment 201, wherein the changing the designated set of one or more blocks to be copied from the source volume to the target volume to include the at least one of the identified one or more blocks in step (d)(i) comprises changing the designated set of one or more blocks to be copied from the source volume to the target volume to include only the at least one of the identified one or more blocks.   203. The method of embodiment 201, wherein the method concludes if no blocks were identified in step (c).   204. The method of embodiment 201, wherein designating the set of one or more blocks to be copied from the source volume to the target volume in step (a) comprises designating at least one of (i) all allocated blocks in the source volume, and (ii) all blocks in the source volume.   205. The method of embodiment 201, further comprising designating a set of excluded blocks in the source volume, wherein the designating the set of one or more blocks to be copied from the source volume to the target volume in step (a) comprises excluding the excluded blocks from the designated set of one or more blocks to be copied from the source volume to the target volume.   206. The method of embodiment 201, wherein the operating system refrains from entering the copy-on-write mode during steps (a), (b), (c), and (d)(i).   207. The method of embodiment 201, further comprising:
       receiving, during step (b), an indication that the operating system has written to a block of the source volume;   determining, during step (b), whether the written-to block has already been copied to the target volume;   if the written-to block has already been copied to the target volume, adding an identifier corresponding to the written-to block to a list of modified blocks; and   if the written-to block has not already been copied to the target volume, refraining from adding the identifier corresponding to the written-to block to the list of modified blocks, wherein step (c) comprises evaluating said list of modified blocks.   
       208. The method of embodiment 207, wherein the evaluating said list of modified blocks comprises identifying the file types associated with at least one of the modified blocks and determining if said file type is designated to be copied.   209. The method of embodiment 201, further comprising:
       receiving, during step (b), an instruction from the operating system to write to a block of the source volume; and   adding an identifier corresponding to the written-to block to a list of modified blocks,   wherein step (c) comprises evaluating said list of modified blocks.   
       210. The method of embodiment 209, wherein the evaluating said list of modified blocks comprises identifying the file types associated with at least one of the modified blocks and determining if said file type is designated to be copied.   211. The method of embodiment 201, wherein the threshold is determined based on a maximum number of blocks that may be transferred from the source volume to the target volume within a target maximum time.   212. The method of embodiment 201, wherein the threshold is determined based on a pre-defined proportion of a total size of at least one of the source volume and the target volume.   213. The method of embodiment 201, wherein the aggregate size of the identified one or more blocks is a numerical count of the identified one or more blocks, and the threshold comprises a number of blocks.   214. The method of embodiment 201, wherein step (d)(ii) comprises copying the at least one of the identified one or more blocks from the source volume to the target volume while the operating system is in the copy-on-write mode.   215. The method of embodiment 201, wherein the source volume is a client device and the target volume is a backup aggregator at a site local to the client device.   216. The method of embodiment 201, wherein the source volume is a client device and the target volume is a storage server at a cloud storage center remote from the client device.   217. The method of embodiment 201, wherein the source volume includes an image-based backup, and wherein the set of one or more blocks to be copied from the source volume to the target volume includes one or more blocks of the image-based backup.   218. The method of embodiment 201, wherein the target volume is a cloud storage volume.   219. The method of embodiment 201, wherein step (b) comprises sending the designated stet of one or more blocks to the target volume via the internet.   220. A method for copying a source volume comprising multiple blocks to a target volume, the method comprising:   (a) designating a set of one or more blocks to be copied from the source volume to the target volume;   (b) copying the designated set of one or more blocks from the source volume to the target volume while an operating system is configured to write to the source volume;   (c) identifying blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during step (b); and   (d) comparing an aggregate size of the identified one or more blocks to a threshold, wherein:
       (d) (i) if the aggregate size is greater than or equal to the threshold:
           changing the designated set of one or more blocks to be copied from the source volume to the target volume to include at least one of the identified one or more blocks, and   repeating steps (b), (c), and (d).   
           
       221. The method of embodiment 220, the changing the designated set of one or more blocks to be copied from the source volume to the target volume to include the at least one of the identified one or more blocks in step (d)(i) comprises changing the designated set of one or more blocks to be copied from the source volume to the target volume to include only the at least one of the identified one or more blocks.   222. The method of embodiment 220, wherein step (d) further comprises:   (d)(ii) if the aggregate size is below the threshold:
       causing the operating system to enter a copy-on-write mode, in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block, and   bringing the target volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered.   
       223. The method of embodiment 220, wherein designating the set of one or more blocks to be copied from the source volume to the target volume in step (a) comprises designating at least one of (i) all allocated blocks in the source volume, and (ii) all blocks in the source volume.   224. The method of embodiment 220, wherein the operating system refrains from entering the copy-on-write mode during steps (a), (b), (c), and (d)(i).   225. The method of embodiment 220, further comprising:   receiving, during step (b), an indication that the operating system has written to a block of the source volume;   determining, during step (b), whether the written-to block has already been copied to the target volume;   if the written-to block has already been copied to the target volume, adding an identifier corresponding to the written-to block to a list of modified blocks; and   wherein step (c) comprises evaluating said list of modified blocks.   226. The method of embodiment 225, wherein the evaluating said list of modified blocks comprises identifying the file types associated with at least one of the modified blocks and determining if said file type is designated to be copied.   227. The method of embodiment 220, wherein the threshold is determined based on a maximum number of blocks that may be transferred from the source volume to the target volume within a target maximum time.   228. The method of embodiment 220, wherein the aggregate size of the identified one or more blocks is a numerical count of the identified one or more blocks, and the threshold comprises a number of blocks.   229. The method of embodiment 220, wherein step (d) (ii) comprises copying the at least one of the identified one or more blocks from the source volume to the target volume while the operating system is in the copy-on-write mode.   230. The method of embodiment 220, wherein the source volume is a client device and the target volume is a backup aggregator at a site local to the client device.   231. The method of embodiment 220, wherein the source volume is a client device and the target volume is a storage server at a cloud storage center remote from the client device.   232. The method of embodiment 220, wherein the source volume includes an image-based backup, and wherein the set of one or more blocks to be copied from the source volume to the target volume includes one or more blocks of the image-based backup.   233. The method of embodiment 220, wherein the target volume is a cloud storage volume.   234. The method of embodiment 220, wherein step (b) comprises sending the designated stet of one or more blocks to the target volume via the internet.   235. A method for copying a source volume comprising multiple blocks to a cloud storage volume while an operating system is configured to write to the source volume, the method comprising:   (a) designating a set of one or more blocks to be copied from the source volume to the cloud storage volume, wherein the source volume includes an image-based backup, and wherein the set of one or more blocks to be copied from the source volume to the cloud storage volume includes one or more blocks of the image-based backup;   (b) copying the designated set of one or more blocks from the source volume to the cloud storage volume while the operating system is configured to write to the source volume by sending the designated stet of one or more blocks to the cloud storage volume via the internet;   (c) identifying blocks of the source volume that were written to by the operating system while the operating system was configured to write to the source volume during step (b);   (d) if one or more blocks were identified in step (c), comparing an aggregate size of the identified one or more blocks to a threshold, wherein:
       (d) (i) if the aggregate size is greater than or equal to the threshold:
           changing the designated set of one or more blocks to be copied from the source volume to the cloud storage volume to include at least one of the identified one or more blocks, and   repeating steps (b), (c), and (d);   
           (d)(ii) if the aggregate size is below the threshold:
           causing the operating system to enter a copy-on-write mode, in which contents of a block of the source volume that is targeted by a write instruction from the operating system are preserved in a copy-on-write file before the write instruction modifies the contents of the targeted block, and   bringing the cloud storage volume into a state consistent with a state of the source volume at the time the copy-on-write mode was entered.   
           
       301. A multi-client snapshot replicating apparatus, comprising:   a memory;   a component collection in the memory, including:
       a source replication component, and   a target replication component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the source replication component, stored in the memory, to:
           obtain, via at least one processor, a replication notification associated with a snapshot of a backup volume at a source node;   determine, via at least one processor, a replication target node associated with the replication notification;   create, via at least one processor, a source node named pipe associated with the snapshot, wherein the source node named pipe is configured to facilitate reading snapshot data of the snapshot from the backup volume;   determine, via at least one processor, a snapshot priority for the snapshot, wherein snapshot priority determines how to order snapshot data from a plurality of snapshots for replication from the source node to the replication target node;   determine, via at least one processor, that the snapshot priority of the snapshot indicates that it is time to send the snapshot to the replication target node;   serialize, via at least one processor, snapshot data of the snapshot, read from the source node named pipe, into one or more chunks;   multiplex, via at least one processor, the one or more chunks associated with the snapshot and one or more chunks associated with one or more other snapshots from the plurality of snapshots into a replication data stream; and   send, via at least one processor, the replication data stream to the replication target node via a persistent network connection between the source node and the replication target node;   
           wherein the processor issues instructions from the target replication component, stored in the memory, to:
           receive, via at least one processor, the replication data stream;   deserialize, via at least one processor, a first chunk associated with the snapshot received via the replication data stream;   determine, via at least one processor, a replication volume associated with the snapshot at the replication target node based on the first chunk&#39;s payload;   create, via at least one processor, a replication target node named pipe associated with the snapshot, wherein the replication target node named pipe is configured to facilitate writing snapshot data of the snapshot to the replication volume;   deserialize, via at least one processor, a second chunk associated with the snapshot received via the replication data stream; and   write, via at least one processor, to the replication target node named pipe snapshot data of the snapshot provided in the second chunk&#39;s payload.   
           
       302. The apparatus of embodiment 301, wherein the replication notification is obtained upon completion of backup of SaaS data of a paired service of a user associated with the backup volume.   303. The apparatus of embodiment 301, wherein the backup volume is configured to store backup data for a client, wherein the client is one of: an entity, a user, a service.   304. The apparatus of embodiment 303, wherein the replication target node associated with the replication notification is determined based on an identifier of the client.   305. The apparatus of embodiment 301, wherein the replication target node associated with the replication notification is determined based on an identifier of the source node.   306. The apparatus of embodiment 303, further, comprising:
       the processor issues instructions from the source replication component, stored in the memory, to:
           determine, via at least one processor, the replication volume associated with the snapshot at the replication target node based on at least one of: an identifier of the client, an identifier of the backup volume.   
           
       307. The apparatus of embodiment 303, wherein the snapshot priority for the snapshot is determined based on at least one of: last backup volume replication timestamp, snapshot size, client identifier.   308. The apparatus of embodiment 301, further, comprising:
       the processor issues instructions from the source replication component, stored in the memory, to:
           add, via at least one processor, an element corresponding to the snapshot and having the snapshot priority to a priority queue; and   determine, via at least one processor, that the snapshot priority of the snapshot indicates that it is time to send the snapshot to the replication target node when the element corresponding to the snapshot has the highest priority in the priority queue.   
           
       309. The apparatus of embodiment 308, further, comprising:
       the processor issues instructions from the source replication component, stored in the memory, to:
           adjust, via at least one processor, the snapshot priority of the element corresponding to the snapshot to match snapshot priorities of one or more other elements in the priority queue corresponding to one or more other snapshots of the backup volume.   
           
       310. The apparatus of embodiment 301, wherein the snapshot data of the snapshot is serialized into the one or more chunks using protocol buffers.   311. The apparatus of embodiment 301, wherein the source replication component is configured to transfer a specified number of snapshots concurrently in the replication data stream.   312. The apparatus of embodiment 301, wherein a data compression technique is utilized to compress the replication data stream, and wherein a compression dictionary for the data compression technique is generated utilizing data from multiple multiplexed snapshots.   313. The apparatus of embodiment 301, wherein the persistent network connection is a TCP/IP connection established to transfer multiplexed snapshot data from a plurality of snapshots for replication from the source node to the replication target node.   314. The apparatus of embodiment 301, wherein the first chunk&#39;s payload includes at least one of: an identifier of the replication volume, an identifier of the backup volume.   315. The apparatus of embodiment 301, further, comprising:
       the processor issues instructions from the target replication component, stored in the memory, to:
           deserialize, via at least one processor, a third chunk associated with the snapshot received via the replication data stream;   finalize, via at least one processor, writing to the replication target node named pipe based on the third chunk&#39;s payload;   determine, via at least one processor, that the replication data stream has been processed; and   terminate, via at least one processor, the persistent network connection between the source node and the replication target node.   
           
       316. A processor-readable multi-client snapshot replicating non-transient physical medium storing processor-executable components, the components, comprising:   a component collection stored in the medium, including:
       a source replication component, and   a target replication component;   wherein the source replication component, stored in the medium, includes processor-issuable instructions to:
           obtain, via at least one processor, a replication notification associated with a snapshot of a backup volume at a source node;   determine, via at least one processor, a replication target node associated with the replication notification;   create, via at least one processor, a source node named pipe associated with the snapshot, wherein the source node named pipe is configured to facilitate reading snapshot data of the snapshot from the backup volume;   determine, via at least one processor, a snapshot priority for the snapshot, wherein snapshot priority determines how to order snapshot data from a plurality of snapshots for replication from the source node to the replication target node;   determine, via at least one processor, that the snapshot priority of the snapshot indicates that it is time to send the snapshot to the replication target node;   serialize, via at least one processor, snapshot data of the snapshot, read from the source node named pipe, into one or more chunks;   multiplex, via at least one processor, the one or more chunks associated with the snapshot and one or more chunks associated with one or more other snapshots from the plurality of snapshots into a replication data stream; and   send, via at least one processor, the replication data stream to the replication target node via a persistent network connection between the source node and the replication target node;   
           wherein the target replication component, stored in the medium, includes processor-issuable instructions to:
           receive, via at least one processor, the replication data stream;   deserialize, via at least one processor, a first chunk associated with the snapshot received via the replication data stream;   determine, via at least one processor, a replication volume associated with the snapshot at the replication target node based on the first chunk&#39;s payload;   create, via at least one processor, a replication target node named pipe associated with the snapshot, wherein the replication target node named pipe is configured to facilitate writing snapshot data of the snapshot to the replication volume;   deserialize, via at least one processor, a second chunk associated with the snapshot received via the replication data stream; and   write, via at least one processor, to the replication target node named pipe snapshot data of the snapshot provided in the second chunk&#39;s payload.   
           
       317. The medium of embodiment 316, wherein the replication notification is obtained upon completion of backup of SaaS data of a paired service of a user associated with the backup volume.   318. The medium of embodiment 316, wherein the backup volume is configured to store backup data for a client, wherein the client is one of: an entity, a user, a service.   319. The medium of embodiment 318, wherein the replication target node associated with the replication notification is determined based on an identifier of the client.   320. The medium of embodiment 316, wherein the replication target node associated with the replication notification is determined based on an identifier of the source node.   321. The medium of embodiment 318, further, comprising:
       the source replication component, stored in the medium, includes processor-issuable instructions to:
           determine, via at least one processor, the replication volume associated with the snapshot at the replication target node based on at least one of: an identifier of the client, an identifier of the backup volume.   
           
       322. The medium of embodiment 318, wherein the snapshot priority for the snapshot is determined based on at least one of: last backup volume replication timestamp, snapshot size, client identifier.   323. The medium of embodiment 316, further, comprising:
       the source replication component, stored in the medium, includes processor-issuable instructions to:
           add, via at least one processor, an element corresponding to the snapshot and having the snapshot priority to a priority queue; and   determine, via at least one processor, that the snapshot priority of the snapshot indicates that it is time to send the snapshot to the replication target node when the element corresponding to the snapshot has the highest priority in the priority queue.   
           
       324. The medium of embodiment 323, further, comprising:
       the source replication component, stored in the medium, includes processor-issuable instructions to:
           adjust, via at least one processor, the snapshot priority of the element corresponding to the snapshot to match snapshot priorities of one or more other elements in the priority queue corresponding to one or more other snapshots of the backup volume.   
           
       325. The medium of embodiment 316, wherein the snapshot data of the snapshot is serialized into the one or more chunks using protocol buffers.   326. The medium of embodiment 316, wherein the source replication component is configured to transfer a specified number of snapshots concurrently in the replication data stream.   327. The medium of embodiment 316, wherein a data compression technique is utilized to compress the replication data stream, and wherein a compression dictionary for the data compression technique is generated utilizing data from multiple multiplexed snapshots.   328. The medium of embodiment 316, wherein the persistent network connection is a TCP/IP connection established to transfer multiplexed snapshot data from a plurality of snapshots for replication from the source node to the replication target node.   329. The medium of embodiment 316, wherein the first chunk&#39;s payload includes at least one of: an identifier of the replication volume, an identifier of the backup volume.   330. The medium of embodiment 316, further, comprising:
       the target replication component, stored in the medium, includes processor-issuable instructions to:
           deserialize, via at least one processor, a third chunk associated with the snapshot received via the replication data stream;   finalize, via at least one processor, writing to the replication target node named pipe based on the third chunk&#39;s payload;   determine, via at least one processor, that the replication data stream has been processed; and   terminate, via at least one processor, the persistent network connection between the source node and the replication target node.   
           
       331. A processor-implemented multi-client snapshot replicating system, comprising:
       a source replication component means, to:
           obtain, via at least one processor, a replication notification associated with a snapshot of a backup volume at a source node;   determine, via at least one processor, a replication target node associated with the replication notification;   create, via at least one processor, a source node named pipe associated with the snapshot, wherein the source node named pipe is configured to facilitate reading snapshot data of the snapshot from the backup volume;   determine, via at least one processor, a snapshot priority for the snapshot, wherein snapshot priority determines how to order snapshot data from a plurality of snapshots for replication from the source node to the replication target node;   determine, via at least one processor, that the snapshot priority of the snapshot indicates that it is time to send the snapshot to the replication target node;   serialize, via at least one processor, snapshot data of the snapshot, read from the source node named pipe, into one or more chunks;   multiplex, via at least one processor, the one or more chunks associated with the snapshot and one or more chunks associated with one or more other snapshots from the plurality of snapshots into a replication data stream; and   send, via at least one processor, the replication data stream to the replication target node via a persistent network connection between the source node and the replication target node;   
           a target replication component means, to:
           receive, via at least one processor, the replication data stream;   deserialize, via at least one processor, a first chunk associated with the snapshot received via the replication data stream;   determine, via at least one processor, a replication volume associated with the snapshot at the replication target node based on the first chunk&#39;s payload;   create, via at least one processor, a replication target node named pipe associated with the snapshot, wherein the replication target node named pipe is configured to facilitate writing snapshot data of the snapshot to the replication volume;   deserialize, via at least one processor, a second chunk associated with the snapshot received via the replication data stream; and   write, via at least one processor, to the replication target node named pipe snapshot data of the snapshot provided in the second chunk&#39;s payload.   
           
       332. The system of embodiment 331, wherein the replication notification is obtained upon completion of backup of SaaS data of a paired service of a user associated with the backup volume.   333. The system of embodiment 331, wherein the backup volume is configured to store backup data for a client, wherein the client is one of: an entity, a user, a service.   334. The system of embodiment 333, wherein the replication target node associated with the replication notification is determined based on an identifier of the client.   335. The system of embodiment 331, wherein the replication target node associated with the replication notification is determined based on an identifier of the source node.   336. The system of embodiment 333, further, comprising:
       the source replication component means, to:
           determine, via at least one processor, the replication volume associated with the snapshot at the replication target node based on at least one of: an identifier of the client, an identifier of the backup volume.   
           
       337. The system of embodiment 333, wherein the snapshot priority for the snapshot is determined based on at least one of: last backup volume replication timestamp, snapshot size, client identifier.   338. The system of embodiment 331, further, comprising:
       the source replication component means, to:
           add, via at least one processor, an element corresponding to the snapshot and having the snapshot priority to a priority queue; and   determine, via at least one processor, that the snapshot priority of the snapshot indicates that it is time to send the snapshot to the replication target node when the element corresponding to the snapshot has the highest priority in the priority queue.   
           
       339. The system of embodiment 338, further, comprising:
       the source replication component means, to:
           adjust, via at least one processor, the snapshot priority of the element corresponding to the snapshot to match snapshot priorities of one or more other elements in the priority queue corresponding to one or more other snapshots of the backup volume.   
           
       340. The system of embodiment 331, wherein the snapshot data of the snapshot is serialized into the one or more chunks using protocol buffers.   341. The system of embodiment 331, wherein the source replication component is configured to transfer a specified number of snapshots concurrently in the replication data stream.   342. The system of embodiment 331, wherein a data compression technique is utilized to compress the replication data stream, and wherein a compression dictionary for the data compression technique is generated utilizing data from multiple multiplexed snapshots.   343. The system of embodiment 331, wherein the persistent network connection is a TCP/IP connection established to transfer multiplexed snapshot data from a plurality of snapshots for replication from the source node to the replication target node.   344. The system of embodiment 331, wherein the first chunk&#39;s payload includes at least one of: an identifier of the replication volume, an identifier of the backup volume.   345. The system of embodiment 331, further, comprising:
       the target replication component means, to:
           deserialize, via at least one processor, a third chunk associated with the snapshot received via the replication data stream;   finalize, via at least one processor, writing to the replication target node named pipe based on the third chunk&#39;s payload;   determine, via at least one processor, that the replication data stream has been processed; and   terminate, via at least one processor, the persistent network connection between the source node and the replication target node.   
           
       346. A processor-implemented multi-client snapshot replicating method, comprising:
       executing processor-implemented source replication component instructions to:
           obtain, via at least one processor, a replication notification associated with a snapshot of a backup volume at a source node;   determine, via at least one processor, a replication target node associated with the replication notification;   create, via at least one processor, a source node named pipe associated with the snapshot, wherein the source node named pipe is configured to facilitate reading snapshot data of the snapshot from the backup volume;   determine, via at least one processor, a snapshot priority for the snapshot, wherein snapshot priority determines how to order snapshot data from a plurality of snapshots for replication from the source node to the replication target node;   determine, via at least one processor, that the snapshot priority of the snapshot indicates that it is time to send the snapshot to the replication target node;   serialize, via at least one processor, snapshot data of the snapshot, read from the source node named pipe, into one or more chunks;   multiplex, via at least one processor, the one or more chunks associated with the snapshot and one or more chunks associated with one or more other snapshots from the plurality of snapshots into a replication data stream; and   send, via at least one processor, the replication data stream to the replication target node via a persistent network connection between the source node and the replication target node;   
           executing processor-implemented target replication component instructions to:
           receive, via at least one processor, the replication data stream;   deserialize, via at least one processor, a first chunk associated with the snapshot received via the replication data stream;   determine, via at least one processor, a replication volume associated with the snapshot at the replication target node based on the first chunk&#39;s payload;   create, via at least one processor, a replication target node named pipe associated with the snapshot, wherein the replication target node named pipe is configured to facilitate writing snapshot data of the snapshot to the replication volume;   deserialize, via at least one processor, a second chunk associated with the snapshot received via the replication data stream; and   write, via at least one processor, to the replication target node named pipe snapshot data of the snapshot provided in the second chunk&#39;s payload.   
           
       347. The method of embodiment 346, wherein the replication notification is obtained upon completion of backup of SaaS data of a paired service of a user associated with the backup volume.   348. The method of embodiment 346, wherein the backup volume is configured to store backup data for a client, wherein the client is one of: an entity, a user, a service.   349. The method of embodiment 348, wherein the replication target node associated with the replication notification is determined based on an identifier of the client.   350. The method of embodiment 346, wherein the replication target node associated with the replication notification is determined based on an identifier of the source node.   351. The method of embodiment 348, further, comprising:
       executing processor-implemented source replication component instructions to:
           determine, via at least one processor, the replication volume associated with the snapshot at the replication target node based on at least one of: an identifier of the client, an identifier of the backup volume.   
           
       352. The method of embodiment 348, wherein the snapshot priority for the snapshot is determined based on at least one of: last backup volume replication timestamp, snapshot size, client identifier.   353. The method of embodiment 346, further, comprising:
       executing processor-implemented source replication component instructions to:
           add, via at least one processor, an element corresponding to the snapshot and having the snapshot priority to a priority queue; and   determine, via at least one processor, that the snapshot priority of the snapshot indicates that it is time to send the snapshot to the replication target node when the element corresponding to the snapshot has the highest priority in the priority queue.   
           
       354. The method of embodiment 353, further, comprising:
       executing processor-implemented source replication component instructions to:
           adjust, via at least one processor, the snapshot priority of the element corresponding to the snapshot to match snapshot priorities of one or more other elements in the priority queue corresponding to one or more other snapshots of the backup volume.   
           
       355. The method of embodiment 346, wherein the snapshot data of the snapshot is serialized into the one or more chunks using protocol buffers.   356. The method of embodiment 346, wherein the source replication component is configured to transfer a specified number of snapshots concurrently in the replication data stream.   357. The method of embodiment 346, wherein a data compression technique is utilized to compress the replication data stream, and wherein a compression dictionary for the data compression technique is generated utilizing data from multiple multiplexed snapshots.   358. The method of embodiment 346, wherein the persistent network connection is a TCP/IP connection established to transfer multiplexed snapshot data from a plurality of snapshots for replication from the source node to the replication target node.   359. The method of embodiment 346, wherein the first chunk&#39;s payload includes at least one of: an identifier of the replication volume, an identifier of the backup volume.   360. The method of embodiment 346, further, comprising:
       executing processor-implemented target replication component instructions to:
           deserialize, via at least one processor, a third chunk associated with the snapshot received via the replication data stream;   finalize, via at least one processor, writing to the replication target node named pipe based on the third chunk&#39;s payload;   determine, via at least one processor, that the replication data stream has been processed; and   terminate, via at least one processor, the persistent network connection between the source node and the replication target node.   
           
       401. A recovery virtual machine restoring apparatus, comprising:   a memory;   a component collection in the memory, including:
       a virtual machine restore processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the virtual machine restore processing component, stored in the memory, to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a virtual machine recovery environment on the recovery device, wherein the virtual machine recovery environment comprises a guest virtual machine running a guest hypervisor;   determine, via at least one processor, by the virtual machine recovery environment, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   determine, via at least one processor, by the virtual machine recovery environment, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the virtual machine recovery environment, the essential data blocks of the backup disk image;   boot, via at least one processor, by the virtual machine recovery environment, an operating system of a nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when a user command is received by the nested guest abridged virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   migrate, via at least one processor, by the virtual machine recovery environment, the nested guest abridged virtual machine to a non-nested guest virtual machine on the recovery device when the nested guest abridged virtual machine is a nested guest complete virtual machine that substantially recreates the backup disk image.   
           
       402. The apparatus of embodiment 401, wherein the recovery device comprises a main guest virtual machine running a main guest hypervisor.   403. The apparatus of embodiment 401, wherein the restore request datastructure is obtained from a recovery software agent as a result of a triggered event.   404. The apparatus of embodiment 403, wherein the triggered event is one of: detecting that the source device is corrupted, detecting that the source device crashed, detecting that the source device is unreachable via network.   405. The apparatus of embodiment 401, wherein the source-nonspecific software to be restored comprises at least one of: operating system, file system, application software, configuration data, user data.   406. The apparatus of embodiment 401, wherein fetching the source-nonspecific software to be restored from a source-nonspecific location provides a lower transmission time penalty compared to fetching from the backup device.   407. The apparatus of embodiment 401, wherein the recovery prioritization index specifies recovery priority rankings for the data blocks of the backup disk image.   408. The apparatus of embodiment 401, wherein the essential data blocks are data blocks sufficient to boot the nested guest abridged virtual machine and to provide partial functionality of the source device via the nested guest abridged virtual machine to a user.   409. The apparatus of embodiment 401, wherein essential data blocks associated with a source-nonspecific software available in equivalent form from a source-nonspecific location are prefetched from the source-nonspecific location, and other essential data blocks are prefetched from the backup device.   410. The apparatus of embodiment 401, wherein the virtual machine recovery environment processes requests from the operating system of the nested guest abridged virtual machine to access data blocks of the backup disk image that have not yet been fetched.   411. The apparatus of embodiment 401, wherein the command data blocks associated with the user command are fetched from the backup device.   412. The apparatus of embodiment 401, wherein the command data blocks associated with the user command are fetched in batches of data blocks associated with an application or a data set.   413. The apparatus of embodiment 401, wherein the remaining data blocks are fetched in batches of data blocks that improve the efficiency of reading or transmitting the remaining data blocks.   414. The apparatus of embodiment 401, wherein the instructions to fetch the remaining data blocks further comprise instructions to:
       select, via at least one processor, a data block with the next highest recovery priority ranking from the remaining data blocks;   determine, via at least one processor, a source-nonspecific discrepancy hash for the selected data block;   determine, via at least one processor, a backup device discrepancy hash for the selected data block; and   determine, via at least one processor, that the selected data block should be fetched either from a source-nonspecific location when the source-nonspecific discrepancy hash matches the backup device discrepancy hash, or from the backup device when the source-nonspecific discrepancy hash does not match the backup device discrepancy hash.   
       415. The apparatus of embodiment 414, wherein the backup device discrepancy hash for the selected data block was precalculated at the time the selected data block was backed up to the backup device.   416. A processor-readable recovery virtual machine restoring non-transient physical medium storing processor-executable components, the components, comprising:   a component collection stored in the medium, including:
       a virtual machine restore processing component;   wherein the virtual machine restore processing component, stored in the medium, includes processor-issuable instructions to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a virtual machine recovery environment on the recovery device, wherein the virtual machine recovery environment comprises a guest virtual machine running a guest hypervisor;   determine, via at least one processor, by the virtual machine recovery environment, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   determine, via at least one processor, by the virtual machine recovery environment, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the virtual machine recovery environment, the essential data blocks of the backup disk image;   boot, via at least one processor, by the virtual machine recovery environment, an operating system of a nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when a user command is received by the nested guest abridged virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   migrate, via at least one processor, by the virtual machine recovery environment, the nested guest abridged virtual machine to a non-nested guest virtual machine on the recovery device when the nested guest abridged virtual machine is a nested guest complete virtual machine that substantially recreates the backup disk image.   
           
       417. The medium of embodiment 416, wherein the recovery device comprises a main guest virtual machine running a main guest hypervisor.   418. The medium of embodiment 416, wherein the restore request datastructure is obtained from a recovery software agent as a result of a triggered event.   419. The medium of embodiment 418, wherein the triggered event is one of: detecting that the source device is corrupted, detecting that the source device crashed, detecting that the source device is unreachable via network.   420. The medium of embodiment 416, wherein the source-nonspecific software to be restored comprises at least one of: operating system, file system, application software, configuration data, user data.   421. The medium of embodiment 416, wherein fetching the source-nonspecific software to be restored from a source-nonspecific location provides a lower transmission time penalty compared to fetching from the backup device.   422. The medium of embodiment 416, wherein the recovery prioritization index specifies recovery priority rankings for the data blocks of the backup disk image.   423. The medium of embodiment 416, wherein the essential data blocks are data blocks sufficient to boot the nested guest abridged virtual machine and to provide partial functionality of the source device via the nested guest abridged virtual machine to a user.   424. The medium of embodiment 416, wherein essential data blocks associated with a source-nonspecific software available in equivalent form from a source-nonspecific location are prefetched from the source-nonspecific location, and other essential data blocks are prefetched from the backup device.   425. The medium of embodiment 416, wherein the virtual machine recovery environment processes requests from the operating system of the nested guest abridged virtual machine to access data blocks of the backup disk image that have not yet been fetched.   426. The medium of embodiment 416, wherein the command data blocks associated with the user command are fetched from the backup device.   427. The medium of embodiment 416, wherein the command data blocks associated with the user command are fetched in batches of data blocks associated with an application or a data set.   428. The medium of embodiment 416, wherein the remaining data blocks are fetched in batches of data blocks that improve the efficiency of reading or transmitting the remaining data blocks.   429. The medium of embodiment 416, wherein the instructions to fetch the remaining data blocks further comprise instructions to:
       select, via at least one processor, a data block with the next highest recovery priority ranking from the remaining data blocks;   determine, via at least one processor, a source-nonspecific discrepancy hash for the selected data block;   determine, via at least one processor, a backup device discrepancy hash for the selected data block; and   determine, via at least one processor, that the selected data block should be fetched either from a source-nonspecific location when the source-nonspecific discrepancy hash matches the backup device discrepancy hash, or from the backup device when the source-nonspecific discrepancy hash does not match the backup device discrepancy hash.   
       430. The medium of embodiment 429, wherein the backup device discrepancy hash for the selected data block was precalculated at the time the selected data block was backed up to the backup device.   431. A processor-implemented recovery virtual machine restoring system, comprising:
       a virtual machine restore processing component means, to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a virtual machine recovery environment on the recovery device, wherein the virtual machine recovery environment comprises a guest virtual machine running a guest hypervisor;   determine, via at least one processor, by the virtual machine recovery environment, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   determine, via at least one processor, by the virtual machine recovery environment, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the virtual machine recovery environment, the essential data blocks of the backup disk image;   boot, via at least one processor, by the virtual machine recovery environment, an operating system of a nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when a user command is received by the nested guest abridged virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   migrate, via at least one processor, by the virtual machine recovery environment, the nested guest abridged virtual machine to a non-nested guest virtual machine on the recovery device when the nested guest abridged virtual machine is a nested guest complete virtual machine that substantially recreates the backup disk image.   
           
       432. The system of embodiment 431, wherein the recovery device comprises a main guest virtual machine running a main guest hypervisor.   433. The system of embodiment 431, wherein the restore request datastructure is obtained from a recovery software agent as a result of a triggered event.   434. The system of embodiment 433, wherein the triggered event is one of: detecting that the source device is corrupted, detecting that the source device crashed, detecting that the source device is unreachable via network.   435. The system of embodiment 431, wherein the source-nonspecific software to be restored comprises at least one of: operating system, file system, application software, configuration data, user data.   436. The system of embodiment 431, wherein fetching the source-nonspecific software to be restored from a source-nonspecific location provides a lower transmission time penalty compared to fetching from the backup device.   437. The system of embodiment 431, wherein the recovery prioritization index specifies recovery priority rankings for the data blocks of the backup disk image.   438. The system of embodiment 431, wherein the essential data blocks are data blocks sufficient to boot the nested guest abridged virtual machine and to provide partial functionality of the source device via the nested guest abridged virtual machine to a user.   439. The system of embodiment 431, wherein essential data blocks associated with a source-nonspecific software available in equivalent form from a source-nonspecific location are prefetched from the source-nonspecific location, and other essential data blocks are prefetched from the backup device.   440. The system of embodiment 431, wherein the virtual machine recovery environment processes requests from the operating system of the nested guest abridged virtual machine to access data blocks of the backup disk image that have not yet been fetched.   441. The system of embodiment 431, wherein the command data blocks associated with the user command are fetched from the backup device.   442. The system of embodiment 431, wherein the command data blocks associated with the user command are fetched in batches of data blocks associated with an application or a data set.   443. The system of embodiment 431, wherein the remaining data blocks are fetched in batches of data blocks that improve the efficiency of reading or transmitting the remaining data blocks.   444. The system of embodiment 431, wherein the means to fetch the remaining data blocks further comprise means to:
       select, via at least one processor, a data block with the next highest recovery priority ranking from the remaining data blocks;   determine, via at least one processor, a source-nonspecific discrepancy hash for the selected data block;   determine, via at least one processor, a backup device discrepancy hash for the selected data block; and   determine, via at least one processor, that the selected data block should be fetched either from a source-nonspecific location when the source-nonspecific discrepancy hash matches the backup device discrepancy hash, or from the backup device when the source-nonspecific discrepancy hash does not match the backup device discrepancy hash.   
       445. The system of embodiment 444, wherein the backup device discrepancy hash for the selected data block was precalculated at the time the selected data block was backed up to the backup device.   446. A processor-implemented recovery virtual machine restoring method, comprising:
       executing processor-implemented virtual machine restore processing component instructions to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a virtual machine recovery environment on the recovery device, wherein the virtual machine recovery environment comprises a guest virtual machine running a guest hypervisor;   determine, via at least one processor, by the virtual machine recovery environment, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   determine, via at least one processor, by the virtual machine recovery environment, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the virtual machine recovery environment, the essential data blocks of the backup disk image;   boot, via at least one processor, by the virtual machine recovery environment, an operating system of a nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when a user command is received by the nested guest abridged virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   migrate, via at least one processor, by the virtual machine recovery environment, the nested guest abridged virtual machine to a non-nested guest virtual machine on the recovery device when the nested guest abridged virtual machine is a nested guest complete virtual machine that substantially recreates the backup disk image.   
           
       447. The method of embodiment 446, wherein the recovery device comprises a main guest virtual machine running a main guest hypervisor.   448. The method of embodiment 446, wherein the restore request datastructure is obtained from a recovery software agent as a result of a triggered event.   449. The method of embodiment 448, wherein the triggered event is one of: detecting that the source device is corrupted, detecting that the source device crashed, detecting that the source device is unreachable via network.   450. The method of embodiment 446, wherein the source-nonspecific software to be restored comprises at least one of: operating system, file system, application software, configuration data, user data.   451. The method of embodiment 446, wherein fetching the source-nonspecific software to be restored from a source-nonspecific location provides a lower transmission time penalty compared to fetching from the backup device.   452. The method of embodiment 446, wherein the recovery prioritization index specifies recovery priority rankings for the data blocks of the backup disk image.   453. The method of embodiment 446, wherein the essential data blocks are data blocks sufficient to boot the nested guest abridged virtual machine and to provide partial functionality of the source device via the nested guest abridged virtual machine to a user.   454. The method of embodiment 446, wherein essential data blocks associated with a source-nonspecific software available in equivalent form from a source-nonspecific location are prefetched from the source-nonspecific location, and other essential data blocks are prefetched from the backup device.   455. The method of embodiment 446, wherein the virtual machine recovery environment processes requests from the operating system of the nested guest abridged virtual machine to access data blocks of the backup disk image that have not yet been fetched.   456. The method of embodiment 446, wherein the command data blocks associated with the user command are fetched from the backup device.   457. The method of embodiment 446, wherein the command data blocks associated with the user command are fetched in batches of data blocks associated with an application or a data set.   458. The method of embodiment 446, wherein the remaining data blocks are fetched in batches of data blocks that improve the efficiency of reading or transmitting the remaining data blocks.   459. The method of embodiment 446, wherein the instructions to fetch the remaining data blocks further comprise instructions to:
       select, via at least one processor, a data block with the next highest recovery priority ranking from the remaining data blocks;   determine, via at least one processor, a source-nonspecific discrepancy hash for the selected data block;   determine, via at least one processor, a backup device discrepancy hash for the selected data block; and   determine, via at least one processor, that the selected data block should be fetched either from a source-nonspecific location when the source-nonspecific discrepancy hash matches the backup device discrepancy hash, or from the backup device when the source-nonspecific discrepancy hash does not match the backup device discrepancy hash.   
       460. The method of embodiment 459, wherein the backup device discrepancy hash for the selected data block was precalculated at the time the selected data block was backed up to the backup device.   501. A recovery virtual machine restoring apparatus, comprising:   a memory;   a component collection in the memory, including:
       a virtual machine restore processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the virtual machine restore processing component, stored in the memory, to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a reestablishing virtual machine on the recovery device;   determine, via at least one processor, by the reestablishing virtual machine, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   determine, via at least one processor, by the reestablishing virtual machine, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the reestablishing virtual machine, the essential data blocks of the backup disk image to build the reestablishing virtual machine into a pseudo abridged virtual machine that includes source-nonspecific software configured differently than the corresponding software on the backup disk image;   provide, via at least one processor, user access to the reestablishing virtual machine, permitting a user to run user commands on the reestablishing virtual machine;   create, via at least one processor, by the reestablishing virtual machine, a latent virtual machine inside the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for both the reestablishing virtual machine and the latent virtual machine, when a user command is received by the reestablishing virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for the latent virtual machine, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   reboot, via at least one processor, the reestablishing virtual machine to boot the latent virtual machine on the recovery device when the latent virtual machine substantially recreates the backup disk image.   
           
       502. The apparatus of embodiment 501, wherein the recovery device comprises host hardware running a host hypervisor.   503. The apparatus of embodiment 501, wherein the restore request datastructure is obtained from a recovery software agent as a result of a triggered event.   504. The apparatus of embodiment 503, wherein the triggered event is one of: detecting that the source device is corrupted, detecting that the source device crashed, detecting that the source device is unreachable via network.   505. The apparatus of embodiment 501, wherein the source-nonspecific software to be restored comprises at least one of: operating system, file system, application software, configuration data, user data.   506. The apparatus of embodiment 501, wherein fetching the source-nonspecific software to be restored from a source-nonspecific location provides a lower transmission time penalty compared to fetching from the backup device.   507. The apparatus of embodiment 501, wherein the recovery prioritization index specifies recovery priority rankings for sets of data blocks of the backup disk image.   508. The apparatus of embodiment 501, wherein the essential data blocks are data blocks sufficient to provide partial functionality similar to corresponding partial functionality of the source device via the reestablishing virtual machine to the user.   509. The apparatus of embodiment 501, wherein essential data blocks associated with a source-nonspecific software available in equivalent form from a source-nonspecific location are prefetched from the source-nonspecific location, and other essential data blocks are prefetched from the backup device.   510. The apparatus of embodiment 501, wherein the latent virtual machine is created using a copy of the essential data blocks prefetched by the reestablishing virtual machine.   511. The apparatus of embodiment 501, wherein the command data blocks associated with the user command are fetched from a source-nonspecific location.   512. The apparatus of embodiment 501, wherein the command data blocks associated with the user command are fetched in batches of data blocks associated with an application or a data set.   513. The apparatus of embodiment 501, wherein the remaining data blocks are fetched in batches of data blocks that improve the efficiency of reading or transmitting the remaining data blocks.   514. The apparatus of embodiment 501, wherein the instructions to fetch the remaining data blocks further comprise instructions to:
       select, via at least one processor, a data block with the next highest recovery priority ranking from the remaining data blocks;   determine, via at least one processor, a source-nonspecific discrepancy hash for the selected data block;   determine, via at least one processor, a backup device discrepancy hash for the selected data block; and   determine, via at least one processor, that the selected data block should be fetched either from a source-nonspecific location when the source-nonspecific discrepancy hash matches the backup device discrepancy hash, or from the backup device when the source-nonspecific discrepancy hash does not match the backup device discrepancy hash.   
       515. The apparatus of embodiment 501, further, comprising:
       the processor issues instructions from the virtual machine restore processing component, stored in the memory, to:
           copy, via at least one processor, boot blocks of the backup disk image onto boot blocks of the reestablishing virtual machine to cause the latent virtual machine to boot upon a reboot.   
           
       516. A processor-readable recovery virtual machine restoring non-transient physical medium storing processor-executable components, the components, comprising:   a component collection stored in the medium, including:
       a virtual machine restore processing component;   wherein the virtual machine restore processing component, stored in the medium, includes processor-issuable instructions to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a reestablishing virtual machine on the recovery device;   determine, via at least one processor, by the reestablishing virtual machine, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   determine, via at least one processor, by the reestablishing virtual machine, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the reestablishing virtual machine, the essential data blocks of the backup disk image to build the reestablishing virtual machine into a pseudo abridged virtual machine that includes source-nonspecific software configured differently than the corresponding software on the backup disk image;   provide, via at least one processor, user access to the reestablishing virtual machine, permitting a user to run user commands on the reestablishing virtual machine;   create, via at least one processor, by the reestablishing virtual machine, a latent virtual machine inside the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for both the reestablishing virtual machine and the latent virtual machine, when a user command is received by the reestablishing virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for the latent virtual machine, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   reboot, via at least one processor, the reestablishing virtual machine to boot the latent virtual machine on the recovery device when the latent virtual machine substantially recreates the backup disk image.   
           
       517. The medium of embodiment 516, wherein the recovery device comprises host hardware running a host hypervisor.   518. The medium of embodiment 516, wherein the restore request datastructure is obtained from a recovery software agent as a result of a triggered event.   519. The medium of embodiment 518, wherein the triggered event is one of: detecting that the source device is corrupted, detecting that the source device crashed, detecting that the source device is unreachable via network.   520. The medium of embodiment 516, wherein the source-nonspecific software to be restored comprises at least one of: operating system, file system, application software, configuration data, user data.   521. The medium of embodiment 516, wherein fetching the source-nonspecific software to be restored from a source-nonspecific location provides a lower transmission time penalty compared to fetching from the backup device.   522. The medium of embodiment 516, wherein the recovery prioritization index specifies recovery priority rankings for sets of data blocks of the backup disk image.   523. The medium of embodiment 516, wherein the essential data blocks are data blocks sufficient to provide partial functionality similar to corresponding partial functionality of the source device via the reestablishing virtual machine to the user.   524. The medium of embodiment 516, wherein essential data blocks associated with a source-nonspecific software available in equivalent form from a source-nonspecific location are prefetched from the source-nonspecific location, and other essential data blocks are prefetched from the backup device.   525. The medium of embodiment 516, wherein the latent virtual machine is created using a copy of the essential data blocks prefetched by the reestablishing virtual machine.   526. The medium of embodiment 516, wherein the command data blocks associated with the user command are fetched from a source-nonspecific location.   527. The medium of embodiment 516, wherein the command data blocks associated with the user command are fetched in batches of data blocks associated with an application or a data set.   528. The medium of embodiment 516, wherein the remaining data blocks are fetched in batches of data blocks that improve the efficiency of reading or transmitting the remaining data blocks.   529. The medium of embodiment 516, wherein the instructions to fetch the remaining data blocks further comprise instructions to:
       select, via at least one processor, a data block with the next highest recovery priority ranking from the remaining data blocks;   determine, via at least one processor, a source-nonspecific discrepancy hash for the selected data block;   determine, via at least one processor, a backup device discrepancy hash for the selected data block; and   determine, via at least one processor, that the selected data block should be fetched either from a source-nonspecific location when the source-nonspecific discrepancy hash matches the backup device discrepancy hash, or from the backup device when the source-nonspecific discrepancy hash does not match the backup device discrepancy hash.   
       530. The medium of embodiment 516, further, comprising:
       the virtual machine restore processing component, stored in the medium, includes processor-issuable instructions to:
           copy, via at least one processor, boot blocks of the backup disk image onto boot blocks of the reestablishing virtual machine to cause the latent virtual machine to boot upon a reboot.   
           
       531. A processor-implemented recovery virtual machine restoring system, comprising:
       a virtual machine restore processing component means, to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a reestablishing virtual machine on the recovery device;   determine, via at least one processor, by the reestablishing virtual machine, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   determine, via at least one processor, by the reestablishing virtual machine, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the reestablishing virtual machine, the essential data blocks of the backup disk image to build the reestablishing virtual machine into a pseudo abridged virtual machine that includes source-nonspecific software configured differently than the corresponding software on the backup disk image;   provide, via at least one processor, user access to the reestablishing virtual machine, permitting a user to run user commands on the reestablishing virtual machine;   create, via at least one processor, by the reestablishing virtual machine, a latent virtual machine inside the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for both the reestablishing virtual machine and the latent virtual machine, when a user command is received by the reestablishing virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for the latent virtual machine, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   reboot, via at least one processor, the reestablishing virtual machine to boot the latent virtual machine on the recovery device when the latent virtual machine substantially recreates the backup disk image.   
           
       532. The system of embodiment 531, wherein the recovery device comprises host hardware running a host hypervisor.   533. The system of embodiment 531, wherein the restore request datastructure is obtained from a recovery software agent as a result of a triggered event.   534. The system of embodiment 533, wherein the triggered event is one of: detecting that the source device is corrupted, detecting that the source device crashed, detecting that the source device is unreachable via network.   535. The system of embodiment 531, wherein the source-nonspecific software to be restored comprises at least one of: operating system, file system, application software, configuration data, user data.   536. The system of embodiment 531, wherein fetching the source-nonspecific software to be restored from a source-nonspecific location provides a lower transmission time penalty compared to fetching from the backup device.   537. The system of embodiment 531, wherein the recovery prioritization index specifies recovery priority rankings for sets of data blocks of the backup disk image.   538. The system of embodiment 531, wherein the essential data blocks are data blocks sufficient to provide partial functionality similar to corresponding partial functionality of the source device via the reestablishing virtual machine to the user.   539. The system of embodiment 531, wherein essential data blocks associated with a source-nonspecific software available in equivalent form from a source-nonspecific location are prefetched from the source-nonspecific location, and other essential data blocks are prefetched from the backup device.   540. The system of embodiment 531, wherein the latent virtual machine is created using a copy of the essential data blocks prefetched by the reestablishing virtual machine.   541. The system of embodiment 531, wherein the command data blocks associated with the user command are fetched from a source-nonspecific location.   542. The system of embodiment 531, wherein the command data blocks associated with the user command are fetched in batches of data blocks associated with an application or a data set.   543. The system of embodiment 531, wherein the remaining data blocks are fetched in batches of data blocks that improve the efficiency of reading or transmitting the remaining data blocks.   544. The system of embodiment 531, wherein the means to fetch the remaining data blocks further comprise means to:
       select, via at least one processor, a data block with the next highest recovery priority ranking from the remaining data blocks;   determine, via at least one processor, a source-nonspecific discrepancy hash for the selected data block;   determine, via at least one processor, a backup device discrepancy hash for the selected data block; and   determine, via at least one processor, that the selected data block should be fetched either from a source-nonspecific location when the source-nonspecific discrepancy hash matches the backup device discrepancy hash, or from the backup device when the source-nonspecific discrepancy hash does not match the backup device discrepancy hash.   
       545. The system of embodiment 531, further, comprising:
       the virtual machine restore processing component means, to:
           copy, via at least one processor, boot blocks of the backup disk image onto boot blocks of the reestablishing virtual machine to cause the latent virtual machine to boot upon a reboot.   
           
       546. A processor-implemented recovery virtual machine restoring method, comprising:
       executing processor-implemented virtual machine restore processing component instructions to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a reestablishing virtual machine on the recovery device;   determine, via at least one processor, by the reestablishing virtual machine, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   determine, via at least one processor, by the reestablishing virtual machine, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the reestablishing virtual machine, the essential data blocks of the backup disk image to build the reestablishing virtual machine into a pseudo abridged virtual machine that includes source-nonspecific software configured differently than the corresponding software on the backup disk image;   provide, via at least one processor, user access to the reestablishing virtual machine, permitting a user to run user commands on the reestablishing virtual machine;   create, via at least one processor, by the reestablishing virtual machine, a latent virtual machine inside the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for both the reestablishing virtual machine and the latent virtual machine, when a user command is received by the reestablishing virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for the latent virtual machine, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   reboot, via at least one processor, the reestablishing virtual machine to boot the latent virtual machine on the recovery device when the latent virtual machine substantially recreates the backup disk image.   
           
       547. The method of embodiment 546, wherein the recovery device comprises host hardware running a host hypervisor.   548. The method of embodiment 546, wherein the restore request datastructure is obtained from a recovery software agent as a result of a triggered event.   549. The method of embodiment 548, wherein the triggered event is one of: detecting that the source device is corrupted, detecting that the source device crashed, detecting that the source device is unreachable via network.   550. The method of embodiment 546, wherein the source-nonspecific software to be restored comprises at least one of: operating system, file system, application software, configuration data, user data.   551. The method of embodiment 546, wherein fetching the source-nonspecific software to be restored from a source-nonspecific location provides a lower transmission time penalty compared to fetching from the backup device.   552. The method of embodiment 546, wherein the recovery prioritization index specifies recovery priority rankings for sets of data blocks of the backup disk image.   553. The method of embodiment 546, wherein the essential data blocks are data blocks sufficient to provide partial functionality similar to corresponding partial functionality of the source device via the reestablishing virtual machine to the user.   554. The method of embodiment 546, wherein essential data blocks associated with a source-nonspecific software available in equivalent form from a source-nonspecific location are prefetched from the source-nonspecific location, and other essential data blocks are prefetched from the backup device.   555. The method of embodiment 546, wherein the latent virtual machine is created using a copy of the essential data blocks prefetched by the reestablishing virtual machine.   556. The method of embodiment 546, wherein the command data blocks associated with the user command are fetched from a source-nonspecific location.   557. The method of embodiment 546, wherein the command data blocks associated with the user command are fetched in batches of data blocks associated with an application or a data set.   558. The method of embodiment 546, wherein the remaining data blocks are fetched in batches of data blocks that improve the efficiency of reading or transmitting the remaining data blocks.   559. The method of embodiment 546, wherein the instructions to fetch the remaining data blocks further comprise instructions to:
       select, via at least one processor, a data block with the next highest recovery priority ranking from the remaining data blocks;   determine, via at least one processor, a source-nonspecific discrepancy hash for the selected data block;   determine, via at least one processor, a backup device discrepancy hash for the selected data block; and   determine, via at least one processor, that the selected data block should be fetched either from a source-nonspecific location when the source-nonspecific discrepancy hash matches the backup device discrepancy hash, or from the backup device when the source-nonspecific discrepancy hash does not match the backup device discrepancy hash.   
       560. The method of embodiment 546, further, comprising:
       executing processor-implemented virtual machine restore processing component instructions to:
           copy, via at least one processor, boot blocks of the backup disk image onto boot blocks of the reestablishing virtual machine to cause the latent virtual machine to boot upon a reboot.   
           
       601. A prioritized and source-nonspecific backup apparatus, comprising:   a memory;   a component collection in the memory, including:
       a prioritized and source-nonspecific backup processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the prioritized and source-nonspecific backup processing component, stored in the memory, to:
           obtain, via at least one processor, a backup configuration request datastructure to configure backups of a data storage volume of a source device;   determine, via at least one processor, a paired backup device for the source device;   generate, via at least one processor, a recovery prioritization index by determining a recovery priority ranking for each selected for backup data block of the data storage volume;   precalculate, via at least one processor, a discrepancy hash for each selected for backup data block of the data storage volume that is available from at least one of a set of source-nonspecific locations, wherein a source-nonspecific location provides a lower transmission time penalty compared to accessing the paired backup device;   update, via at least one processor, the recovery prioritization index periodically to account for use of data blocks since the last time the recovery prioritization index was updated;   update, via at least one processor, discrepancy hashes periodically to account for use of data blocks since the last time the discrepancy hashes were updated; and   send, via at least one processor, backup data from the source device to the paired backup device, wherein the backup data includes at least one of the updated recovery prioritization index and the updated discrepancy hashes.   
           
       602. The apparatus of embodiment 601, further, comprising:
       the processor issues instructions from the prioritized and source-nonspecific backup processing component, stored in the memory, to:
           generate, via at least one processor, a source device configuration table, wherein the source device configuration table identifies a set of installed software applications on the source device that are available in equivalent form in the set of source-nonspecific locations.   
           
       603. The apparatus of embodiment 602, wherein the source device configuration table identifies a version number of an installed software application.   604. The apparatus of embodiment 602, wherein the source device configuration table identifies a network address of an associated source-nonspecific location that contains an installed software application in equivalent form.   605. The apparatus of embodiment 601, wherein the paired backup device is cloud storage.   606. The apparatus of embodiment 601, wherein a data block is a sequence of data having a nominal length.   607. The apparatus of embodiment 601, wherein the instructions to generate a recovery prioritization index further comprise instructions to:
       determine, via at least one processor, a specified recovery priority ranking for a specified software application;   determine, via at least one processor, application files corresponding to the specified software application;   determine, via at least one processor, application data blocks corresponding to the determined application files; and   associate, via at least one processor, the specified recovery priority ranking to the determined application data blocks.   
       608. The apparatus of embodiment 601, wherein the instructions to generate a recovery prioritization index further comprise instructions to:
       determine, via at least one processor, a specified recovery priority ranking for a specified file;   determine, via at least one processor, file data blocks corresponding to the specified file; and   assign, via at least one processor, the specified recovery priority ranking to the determined file data blocks.   
       609. The apparatus of embodiment 601, wherein the recovery prioritization index includes an essential flag that specifies whether a data block is essential to fetch prior to booting an operating system of a recovery device.   610. The apparatus of embodiment 601, wherein the recovery prioritization index is updated to account for frequency of use of data blocks.   611. The apparatus of embodiment 601, wherein a discrepancy hash of a hashed data block is precalculated at a time of low CPU use.   612. The apparatus of embodiment 601, wherein a discrepancy hash of a hashed data block is precalculated using a cryptographic hash function.   613. The apparatus of embodiment 612, wherein the cryptographic hash function used by the source device is the same as the cryptographic hash function used by the source-nonspecific location from which the hashed data block is available to precalculate discrepancy hashes.   614. The apparatus of embodiment 601, wherein a discrepancy hash of a hashed data block is updated when the hashed data block is modified.   615. The apparatus of embodiment 601, wherein the backup data includes data blocks to be backed up.   616. A processor-readable prioritized and source-nonspecific backup non-transient physical medium storing processor-executable components, the components, comprising:   a component collection stored in the medium, including:
       a prioritized and source-nonspecific backup processing component;   wherein the prioritized and source-nonspecific backup processing component, stored in the medium, includes processor-issuable instructions to:
           obtain, via at least one processor, a backup configuration request datastructure to configure backups of a data storage volume of a source device;   determine, via at least one processor, a paired backup device for the source device;   generate, via at least one processor, a recovery prioritization index by determining a recovery priority ranking for each selected for backup data block of the data storage volume;   precalculate, via at least one processor, a discrepancy hash for each selected for backup data block of the data storage volume that is available from at least one of a set of source-nonspecific locations, wherein a source-nonspecific location provides a lower transmission time penalty compared to accessing the paired backup device;   update, via at least one processor, the recovery prioritization index periodically to account for use of data blocks since the last time the recovery prioritization index was updated;   update, via at least one processor, discrepancy hashes periodically to account for use of data blocks since the last time the discrepancy hashes were updated; and   send, via at least one processor, backup data from the source device to the paired backup device, wherein the backup data includes at least one of the updated recovery prioritization index and the updated discrepancy hashes.   
           
       617. The medium of embodiment 616, further, comprising:
       the prioritized and source-nonspecific backup processing component, stored in the medium, includes processor-issuable instructions to:
           generate, via at least one processor, a source device configuration table, wherein the source device configuration table identifies a set of installed software applications on the source device that are available in equivalent form in the set of source-nonspecific locations.   
           
       618. The medium of embodiment 617, wherein the source device configuration table identifies a version number of an installed software application.   619. The medium of embodiment 617, wherein the source device configuration table identifies a network address of an associated source-nonspecific location that contains an installed software application in equivalent form.   620. The medium of embodiment 616, wherein the paired backup device is cloud storage.   621. The medium of embodiment 616, wherein a data block is a sequence of data having a nominal length.   622. The medium of embodiment 616, wherein the instructions to generate a recovery prioritization index further comprise instructions to:
       determine, via at least one processor, a specified recovery priority ranking for a specified software application;   determine, via at least one processor, application files corresponding to the specified software application;   determine, via at least one processor, application data blocks corresponding to the determined application files; and   associate, via at least one processor, the specified recovery priority ranking with the determined application data blocks.   
       623. The medium of embodiment 616, wherein the instructions to generate a recovery prioritization index further comprise instructions to:
       determine, via at least one processor, a specified recovery priority ranking for a specified file;   determine, via at least one processor, file data blocks corresponding to the specified file; and   assign, via at least one processor, the specified recovery priority ranking to the determined file data blocks.   
       624. The medium of embodiment 616, wherein the recovery prioritization index includes an essential flag that specifies whether a data block is essential to fetch prior to booting an operating system of a recovery device.   625. The medium of embodiment 616, wherein the recovery prioritization index is updated to account for frequency of use of data blocks.   626. The medium of embodiment 616, wherein a discrepancy hash of a hashed data block is precalculated at a time of low CPU use.   627. The medium of embodiment 616, wherein a discrepancy hash of a hashed data block is precalculated using a cryptographic hash function.   628. The medium of embodiment 627, wherein the cryptographic hash function used by the source device is the same as the cryptographic hash function used by the source-nonspecific location from which the hashed data block is available to precalculate discrepancy hashes.   629. The medium of embodiment 616, wherein a discrepancy hash of a hashed data block is updated when the hashed data block is modified.   630. The medium of embodiment 616, wherein the backup data includes data blocks to be backed up.   631. A processor-implemented prioritized and source-nonspecific backup system, comprising:
       a prioritized and source-nonspecific backup processing component means, to:
           obtain, via at least one processor, a backup configuration request datastructure to configure backups of a data storage volume of a source device;   determine, via at least one processor, a paired backup device for the source device;   generate, via at least one processor, a recovery prioritization index by determining a recovery priority ranking for each selected for backup data block of the data storage volume;   precalculate, via at least one processor, a discrepancy hash for each selected for backup data block of the data storage volume that is available from at least one of a set of source-nonspecific locations, wherein a source-nonspecific location provides a lower transmission time penalty compared to accessing the paired backup device;   update, via at least one processor, the recovery prioritization index periodically to account for use of data blocks since the last time the recovery prioritization index was updated;   update, via at least one processor, discrepancy hashes periodically to account for use of data blocks since the last time the discrepancy hashes were updated; and   send, via at least one processor, backup data from the source device to the paired backup device, wherein the backup data includes at least one of the updated recovery prioritization index and the updated discrepancy hashes.   
           
       632. The system of embodiment 631, further, comprising:
       the prioritized and source-nonspecific backup processing component means, to:
           generate, via at least one processor, a source device configuration table, wherein the source device configuration table identifies a set of installed software applications on the source device that are available in equivalent form in the set of source-nonspecific locations.   
           
       633. The system of embodiment 632, wherein the source device configuration table identifies a version number of an installed software application.   634. The system of embodiment 632, wherein the source device configuration table identifies a network address of an associated source-nonspecific location that contains an installed software application in equivalent form.   635. The system of embodiment 631, wherein the paired backup device is cloud storage.   636. The system of embodiment 631, wherein a data block is a sequence of data having a nominal length.   637. The system of embodiment 631, wherein the means to generate a recovery prioritization index further comprise means to:
       determine, via at least one processor, a specified recovery priority ranking for a specified software application;   determine, via at least one processor, application files corresponding to the specified software application;   determine, via at least one processor, application data blocks corresponding to the determined application files; and   associate, via at least one processor, the specified recovery priority ranking with the determined application data blocks.   
       638. The system of embodiment 631, wherein the means to generate a recovery prioritization index further comprise means to:
       determine, via at least one processor, a specified recovery priority ranking for a specified file;   determine, via at least one processor, file data blocks corresponding to the specified file; and   assign, via at least one processor, the specified recovery priority ranking to the determined file data blocks.   
       639. The system of embodiment 631, wherein the recovery prioritization index includes an essential flag that specifies whether a data block is essential to fetch prior to booting an operating system of a recovery device.   640. The system of embodiment 631, wherein the recovery prioritization index is updated to account for frequency of use of data blocks.   641. The system of embodiment 631, wherein a discrepancy hash of a hashed data block is precalculated at a time of low CPU use.   642. The system of embodiment 631, wherein a discrepancy hash of a hashed data block is precalculated using a cryptographic hash function.   643. The system of embodiment 642, wherein the cryptographic hash function used by the source device is the same as the cryptographic hash function used by the source-nonspecific location from which the hashed data block is available to precalculate discrepancy hashes.   644. The system of embodiment 631, wherein a discrepancy hash of a hashed data block is updated when the hashed data block is modified.   645. The system of embodiment 631, wherein the backup data includes data blocks to be backed up.   646. A processor-implemented prioritized and source-nonspecific backup method, comprising:
       executing processor-implemented prioritized and source-nonspecific backup processing component instructions to:
           obtain, via at least one processor, a backup configuration request datastructure to configure backups of a data storage volume of a source device;   determine, via at least one processor, a paired backup device for the source device;   generate, via at least one processor, a recovery prioritization index by determining a recovery priority ranking for each selected for backup data block of the data storage volume;   precalculate, via at least one processor, a discrepancy hash for each selected for backup data block of the data storage volume that is available from at least one of a set of source-nonspecific locations, wherein a source-nonspecific location provides a lower transmission time penalty compared to accessing the paired backup device;   update, via at least one processor, the recovery prioritization index periodically to account for use of data blocks since the last time the recovery prioritization index was updated;   update, via at least one processor, discrepancy hashes periodically to account for use of data blocks since the last time the discrepancy hashes were updated; and   send, via at least one processor, backup data from the source device to the paired backup device, wherein the backup data includes at least one of the updated recovery prioritization index and the updated discrepancy hashes.   
           
       647. The method of embodiment 646, further, comprising:
       executing processor-implemented prioritized and source-nonspecific backup processing component instructions to:
           generate, via at least one processor, a source device configuration table, wherein the source device configuration table identifies a set of installed software applications on the source device that are available in equivalent form in the set of source-nonspecific locations.   
           
       648. The method of embodiment 647, wherein the source device configuration table identifies a version number of an installed software application.   649. The method of embodiment 647, wherein the source device configuration table identifies a network address of an associated source-nonspecific location that contains an installed software application in equivalent form.   650. The method of embodiment 646, wherein the paired backup device is cloud storage.   651. The method of embodiment 646, wherein a data block is a sequence of data having a nominal length.   652. The method of embodiment 646, wherein the instructions to generate a recovery prioritization index further comprise instructions to:
       determine, via at least one processor, a specified recovery priority ranking for a specified software application;   determine, via at least one processor, application files corresponding to the specified software application;   determine, via at least one processor, application data blocks corresponding to the determined application files; and   associate, via at least one processor, the specified recovery priority ranking with the determined application data blocks.   
       653. The method of embodiment 646, wherein the instructions to generate a recovery prioritization index further comprise instructions to:
       determine, via at least one processor, a specified recovery priority ranking for a specified file;   determine, via at least one processor, file data blocks corresponding to the specified file; and   assign, via at least one processor, the specified recovery priority ranking to the determined file data blocks.   
       654. The method of embodiment 646, wherein the recovery prioritization index includes an essential flag that specifies whether a data block is essential to fetch prior to booting an operating system of a recovery device.   655. The method of embodiment 646, wherein the recovery prioritization index is updated to account for frequency of use of data blocks.   656. The method of embodiment 646, wherein a discrepancy hash of a hashed data block is precalculated at a time of low CPU use.   657. The method of embodiment 646, wherein a discrepancy hash of a hashed data block is precalculated using a cryptographic hash function.   658. The method of embodiment 657, wherein the cryptographic hash function used by the source device is the same as the cryptographic hash function used by the source-nonspecific location from which the hashed data block is available to precalculate discrepancy hashes.   659. The method of embodiment 646, wherein a discrepancy hash of a hashed data block is updated when the hashed data block is modified.   660. The method of embodiment 646, wherein the backup data includes data blocks to be backed up.   701. A recovery virtual machine restoring apparatus, comprising:   a memory;   a component collection in the memory, including:
       a virtual machine restore processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the virtual machine restore processing component, stored in the memory, to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a virtual machine recovery environment on the recovery device, wherein the virtual machine recovery environment comprises a guest virtual machine running a guest hypervisor;   determine, via at least one processor, by the virtual machine recovery environment, a recovery virtual machine configuration for the recovery virtual machine;   determine, via at least one processor, by the virtual machine recovery environment, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the virtual machine recovery environment, the essential data blocks of the backup disk image;   boot, via at least one processor, by the virtual machine recovery environment, an operating system of a nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when a user command is received by the nested guest abridged virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index; and   migrate, via at least one processor, by the virtual machine recovery environment, the nested guest abridged virtual machine to a non-nested guest virtual machine on the recovery device when the nested guest abridged virtual machine is a nested guest complete virtual machine that substantially recreates the backup disk image.   
           
       702. A recovery virtual machine restoring apparatus, comprising:   a memory;   a component collection in the memory, including:
       a virtual machine restore processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the virtual machine restore processing component, stored in the memory, to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a virtual machine recovery environment on the recovery device, wherein the virtual machine recovery environment comprises a guest virtual machine running a guest hypervisor;   determine, via at least one processor, by the virtual machine recovery environment, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   boot, via at least one processor, by the virtual machine recovery environment, an operating system of a nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when a user command is received by the nested guest abridged virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the nested guest abridged virtual machine;   fetch, via at least one processor, by the virtual machine recovery environment, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   migrate, via at least one processor, by the virtual machine recovery environment, the nested guest abridged virtual machine to a non-nested guest virtual machine on the recovery device when the nested guest abridged virtual machine is a nested guest complete virtual machine that substantially recreates the backup disk image.   
           
       703. A recovery virtual machine restoring apparatus, comprising:   a memory;   a component collection in the memory, including:
       a virtual machine restore processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the virtual machine restore processing component, stored in the memory, to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a reestablishing virtual machine on the recovery device;   determine, via at least one processor, by the reestablishing virtual machine, a recovery virtual machine configuration for the recovery virtual machine;   determine, via at least one processor, by the reestablishing virtual machine, a recovery prioritization index for data blocks of the backup disk image, wherein the recovery prioritization index identifies essential data blocks of the backup disk image;   prefetch, via at least one processor, by the reestablishing virtual machine, the essential data blocks of the backup disk image to build the reestablishing virtual machine into a pseudo abridged virtual machine;   provide, via at least one processor, user access to the reestablishing virtual machine, permitting a user to run user commands on the reestablishing virtual machine;   create, via at least one processor, by the reestablishing virtual machine, a latent virtual machine inside the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for both the reestablishing virtual machine and the latent virtual machine, when a user command is received by the reestablishing virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for the latent virtual machine, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, in priority order specified by the recovery prioritization index; and   reboot, via at least one processor, the reestablishing virtual machine to boot the latent virtual machine on the recovery device when the latent virtual machine substantially recreates the backup disk image.   
           
       704. A recovery virtual machine restoring apparatus, comprising:   a memory;   a component collection in the memory, including:
       a virtual machine restore processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the virtual machine restore processing component, stored in the memory, to:
           obtain, via at least one processor, by a recovery device, a restore request datastructure to build a recovery virtual machine using a backup disk image of a source device, wherein the backup disk image is stored on a backup device;   boot, via at least one processor, a reestablishing virtual machine on the recovery device;   determine, via at least one processor, by the reestablishing virtual machine, a recovery virtual machine configuration for the recovery virtual machine, wherein the recovery virtual machine configuration identifies source-nonspecific software to be restored, wherein the source-nonspecific software is available from a set of source-nonspecific locations;   prefetch, via at least one processor, by the reestablishing virtual machine, data blocks of the backup disk image to build the reestablishing virtual machine into a pseudo abridged virtual machine that includes source-nonspecific software configured differently than the corresponding software on the backup disk image;   provide, via at least one processor, user access to the reestablishing virtual machine, permitting a user to run user commands on the reestablishing virtual machine;   create, via at least one processor, by the reestablishing virtual machine, a latent virtual machine inside the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for both the reestablishing virtual machine and the latent virtual machine, when a user command is received by the reestablishing virtual machine, command data blocks associated with the user command that have not yet been fetched, and execute the user command by the reestablishing virtual machine;   fetch, via at least one processor, by the reestablishing virtual machine for the latent virtual machine, when not fetching command data blocks, remaining data blocks of the backup disk image that have not yet been fetched, wherein the remaining data blocks are fetched from a source-nonspecific location when the remaining data blocks are available in equivalent form from the source-nonspecific location, and wherein the remaining data blocks are fetched from the backup device when the remaining data blocks are not available in equivalent form from a source-nonspecific location; and   reboot, via at least one processor, the reestablishing virtual machine to boot the latent virtual machine on the recovery device when the latent virtual machine substantially recreates the backup disk image.   
           
       705. A prioritized backup apparatus, comprising:   a memory;   a component collection in the memory, including:
       a prioritized backup processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the prioritized backup processing component, stored in the memory, to:
           obtain, via at least one processor, a backup configuration request datastructure to configure backups of a data storage volume of a source device;   determine, via at least one processor, a paired backup device for the source device;   generate, via at least one processor, a recovery prioritization index by determining a recovery priority ranking for each selected for backup data block of the data storage volume;   update, via at least one processor, the recovery prioritization index periodically to account for use of data blocks since the last time the recovery prioritization index was updated; and   send, via at least one processor, backup data from the source device to the paired backup device, wherein the backup data includes at least the updated recovery prioritization index.   
           
       706. A source-nonspecific backup apparatus, comprising:   a memory;   a component collection in the memory, including:
       a source-nonspecific backup processing component;   
       a processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory,
       wherein the processor issues instructions from the source-nonspecific backup processing component, stored in the memory, to:
           obtain, via at least one processor, a backup configuration request datastructure to configure backups of a data storage volume of a source device;   determine, via at least one processor, a paired backup device for the source device;   precalculate, via at least one processor, a discrepancy hash for each selected for backup data block of the data storage volume that is available from at least one of a set of source-nonspecific locations, wherein a source-nonspecific location provides a lower transmission time penalty compared to accessing the paired backup device;   update, via at least one processor, discrepancy hashes periodically to account for use of data blocks since the last time the discrepancy hashes were updated; and   send, via at least one processor, backup data from the source device to the paired backup device, wherein the backup data includes at least the updated discrepancy hashes.   
           
       

     In order to address various issues and advance the art, the entirety of this application for Prioritization and Source-Nonspecific Based Virtual Machine Recovery Apparatuses, Methods and Systems (including the Cover Page, Title, Headings, Field, Background, Summary, Brief Description of the Drawings, Detailed Description, Claims, Abstract, Figures, Appendices, and otherwise) shows, by way of illustration, various embodiments in which the claimed innovations may be practiced. The advantages and features of the application are of a representative sample of embodiments only, and are not exhaustive and/or exclusive. They are presented only to assist in understanding and teach the claimed principles. It should be understood that they are not representative of all claimed innovations. As such, certain aspects of the disclosure have not been discussed herein. That alternate embodiments may not have been presented for a specific portion of the innovations or that further undescribed alternate embodiments may be available for a portion is not to be considered a disclaimer of those alternate embodiments. It will be appreciated that many of those undescribed embodiments incorporate the same principles of the innovations and others are equivalent. Thus, it is to be understood that other embodiments may be utilized and functional, logical, operational, organizational, structural and/or topological modifications may be made without departing from the scope and/or spirit of the disclosure. As such, all examples and/or embodiments are deemed to be non-limiting throughout this disclosure. Further and to the extent any financial and/or investment examples are included, such examples are for illustrative purpose(s) only, and are not, nor should they be interpreted, as investment advice. Also, no inference should be drawn regarding those embodiments discussed herein relative to those not discussed herein other than it is as such for purposes of reducing space and repetition. For instance, it is to be understood that the logical and/or topological structure of any combination of any program components (a component collection), other components, data flow order, logic flow order, and/or any present feature sets as described in the figures and/or throughout are not limited to a fixed operating order and/or arrangement, but rather, any disclosed order is exemplary and all equivalents, regardless of order, are contemplated by the disclosure. Similarly, descriptions of embodiments disclosed throughout this disclosure, any reference to direction or orientation is merely intended for convenience of description and is not intended in any way to limit the scope of described embodiments. Relative terms such as “lower”, “upper”, “horizontal”, “vertical”, “above”, “below”, “up”, “down”, “top” and “bottom” as well as derivative thereof (e.g., “horizontally”, “downwardly”, “upwardly”, etc.) should not be construed to limit embodiments, and instead, again, are offered for convenience of description of orientation. These relative descriptors are for convenience of description only and do not require that any embodiments be constructed or operated in a particular orientation unless explicitly indicated as such. Terms such as “attached”, “affixed”, “connected”, “coupled”, “interconnected”, and similar may refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise. Furthermore, it is to be understood that such features are not limited to serial execution, but rather, any number of threads, processes, services, servers, and/or the like that may execute asynchronously, concurrently, in parallel, simultaneously, synchronously, and/or the like are contemplated by the disclosure. As such, some of these features may be mutually contradictory, in that they cannot be simultaneously present in a single embodiment. Similarly, some features are applicable to one aspect of the innovations, and inapplicable to others. In addition, the disclosure includes other innovations not presently claimed. Applicant reserves all rights in those presently unclaimed innovations including the right to claim such innovations, file additional applications, continuations, continuations in part, divisions, and/or the like thereof. As such, it should be understood that advantages, embodiments, examples, functional, features, logical, operational, organizational, structural, topological, and/or other aspects of the disclosure are not to be considered limitations on the disclosure as defined by the claims or limitations on equivalents to the claims. It is to be understood that, depending on the particular needs and/or characteristics of a MBR individual and/or enterprise user, database configuration and/or relational model, data type, data transmission and/or network framework, syntax structure, and/or the like, various embodiments of the MBR, may be implemented that allow a great deal of flexibility and customization. For example, aspects of the MBR may be adapted for storage management systems. While various embodiments and discussions of the MBR have included backup systems, however, it is to be understood that the embodiments described herein may be readily configured and/or customized for a wide variety of other applications and/or implementations.