Patent ID: 9158804
Filing Date: 2015-10-13
Classification: G06F

Abstract:
1. A method comprising: receiving a plurality of block identifiers identifying blocks on a storage volume; determining a location of a file table zone that stores a plurality of file table records, each file table record storing a timestamp indicating a time a file associated with the file table record was last modified; intersecting the location of the file table zone with the plurality of block identifiers to create an intersection comprising at least a subset of file table records, wherein each file table record in the subset is associated with a block from the file table zone that corresponds to a block identified by the plurality of block identifiers; parsing each file table record of the subset of file table records to extract the timestamp indicating the time the file associated with the file table record was last modified; comparing the extracted timestamp with a last backup date of the storage volume; joining a record sequence number and a record number extracted from the file table record to form a file reference number (FRN); and obtaining a file path of the associated file using the FRN, and providing the file path to a backup engine to permit the backup engine to backup the associated file, when the comparison indicates the associated file was modified after the last backup date.