Package: borgbackup
What is BorgBackup?BorgBackup (short: Borg) is a deduplicating backup program.
Optionally, it supports compression and authenticated encryption.The main goal of Borg is to provide an efficient and secure way to backup data.
The data deduplication technique used makes Borg suitable for daily backups
since only changes are stored.
The authenticated encryption technique makes it suitable for backups to not
fully trusted targets.See theinstallation manualor, if you have already
downloaded Borg,docs/installation.rstto get started with Borg.
There is also anoffline documentationavailable, in multiple formats.Main featuresSpace efficient storageDeduplication based on content-defined chunking is used to reduce the number
of bytes stored: each file is split into a number of variable length chunks
and only chunks that have never been seen before are added to the repository.A chunk is considered duplicate if its id_hash value is identical.
A cryptographically strong hash or MAC function is used as id_hash, e.g.
(hmac-)sha256.To deduplicate, all the chunks in the same repository are considered, no
matter whether they come from different machines, from previous backups,
from the same backup or even from the same single file.Compared to other deduplication approaches, this method does NOT depend on:file/directory names staying the same: So you can move your stuff around
without killing the deduplication, even between machines sharing a repo.complete files or time stamps staying the same: If a big file changes a
little, only a few new chunks need to be stored - this is great for VMs or
raw disks.The absolute position of a data chunk inside a file: Stuff may get shifted
and will still be found by the deduplication algorithm.Speedperformance-critical code (chunking, compression, encryption) is
implemented in C/Cythonlocal caching of files/chunks index dataquick detection of unmodified filesData encryptionAll data can be protected using 256-bit AES encryption, data integrity and
authenticity is verified using HMAC-SHA256. Data is encrypted clientside.ObfuscationOptionally, borg can actively obfuscate e.g. the size of files / chunks to
make fingerprinting attacks more difficult.CompressionAll data can be optionally compressed:lz4 (super fast, low compression)zstd (wide range from high speed and low compression to high compression
and lower speed)zlib (medium speed and compression)lzma (low speed, high compression)Off-site backupsBorg can store data on any remote host accessible over SSH.  If Borg is
installed on the remote host, big performance gains can be achieved
compared to using a network filesystem (sshfs, nfs, …).Backups mountable as filesystemsBackup archives are mountable as userspace filesystems for easy interactive
backup examination and restores (e.g. by using a regular file manager).Easy installation on multiple platformsWe offer single-file binaries that do not require installing anything -
you can just run them on these platforms:LinuxMac OS XFreeBSDOpenBSD and NetBSD (no xattrs/ACLs support or binaries yet)Cygwin (experimental, no binaries yet)Linux Subsystem of Windows 10 (experimental)Free and Open Source Softwaresecurity and functionality can be audited independentlylicensed under the BSD (3-clause) license, seeLicensefor the
complete licenseEasy to useInitialize a new backup repository (seeborg init--helpfor encryption options):$ borg init -e repokey /path/to/repoCreate a backup archive:$ borg create /path/to/repo::Saturday1 ~/DocumentsNow doing another backup, just to show off the great deduplication:$ borg create -v --stats /path/to/repo::Saturday2 ~/Documents
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Archive name: Saturday2
Archive fingerprint: 622b7c53c...
Time (start): Sat, 2016-02-27 14:48:13
Time (end):   Sat, 2016-02-27 14:48:14
Duration: 0.88 seconds
Number of files: 163
-----------------------------------------------------------------------------
               Original size      Compressed size    Deduplicated size
This archive:        6.85 MB              6.85 MB             30.79 kB  <-- !
All archives:       13.69 MB             13.71 MB              6.88 MB

               Unique chunks         Total chunks
Chunk index:             167                  330
-----------------------------------------------------------------------------For a graphical frontend refer to our complementary projectBorgWeb.Helping, Donations and Bounties, becoming a PatronYour help is always welcome!Spread the word, give feedback, help with documentation, testing or development.You can also give monetary support to the project, see there for details:https://www.borgbackup.org/support/fund.htmlLinksMain Web SiteReleases,PyPI packagesandChangeLogOffline DocumentationGitHubandIssue Tracker.Web-Chat (IRC)andMailing ListLicenseSecurity contactCompatibility notesEXPECT THAT WE WILL BREAK COMPATIBILITY REPEATEDLY WHEN MAJOR RELEASE NUMBER
CHANGES (like when going from 0.x.y to 1.0.0 or from 1.x.y to 2.0.0).NOT RELEASED DEVELOPMENT VERSIONS HAVE UNKNOWN COMPATIBILITY PROPERTIES.THIS IS SOFTWARE IN DEVELOPMENT, DECIDE YOURSELF WHETHER IT FITS YOUR NEEDS.Security issues should be reported to theSecurity contact(or
seedocs/support.rstin the source distribution).