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What is BorgBackup?
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===================
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BorgBackup (short: Borg) is a deduplicating backup program.
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Optionally, it supports compression and authenticated encryption.
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The main goal of Borg is to provide an efficient and secure way to backup data.
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The data deduplication technique used makes Borg suitable for daily backups
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since only changes are stored.
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The authenticated encryption technique makes it suitable for backups to not
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fully trusted targets.
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See the `installation manual`_ or, if you have already
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downloaded Borg, ``docs/installation.rst`` to get started with Borg.
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.. _installation manual: https://borgbackup.readthedocs.org/en/stable/installation.html
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Main features
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-------------
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**Space efficient storage**
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Deduplication based on content-defined chunking is used to reduce the number
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of bytes stored: each file is split into a number of variable length chunks
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and only chunks that have never been seen before are added to the repository.
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To deduplicate, all the chunks in the same repository are considered, no
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matter whether they come from different machines, from previous backups,
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from the same backup or even from the same single file.
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Compared to other deduplication approaches, this method does NOT depend on:
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* file/directory names staying the same: So you can move your stuff around
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without killing the deduplication, even between machines sharing a repo.
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* complete files or time stamps staying the same: If a big file changes a
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little, only a few new chunks need to be stored - this is great for VMs or
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raw disks.
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* The absolute position of a data chunk inside a file: Stuff may get shifted
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and will still be found by the deduplication algorithm.
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**Speed**
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* performance critical code (chunking, compression, encryption) is
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implemented in C/Cython
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* local caching of files/chunks index data
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* quick detection of unmodified files
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**Data encryption**
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All data can be protected using 256-bit AES encryption, data integrity and
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authenticity is verified using HMAC-SHA256. Data is encrypted clientside.
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**Compression**
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All data can be compressed by lz4 (super fast, low compression), zlib
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(medium speed and compression) or lzma (low speed, high compression).
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**Off-site backups**
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Borg can store data on any remote host accessible over SSH. If Borg is
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installed on the remote host, big performance gains can be achieved
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compared to using a network filesystem (sshfs, nfs, ...).
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**Backups mountable as filesystems**
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Backup archives are mountable as userspace filesystems for easy interactive
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backup examination and restores (e.g. by using a regular file manager).
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**Easy installation on multiple platforms**
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We offer single-file binaries that do not require installing anything -
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you can just run them on these platforms:
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* Linux
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* Mac OS X
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* FreeBSD
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* OpenBSD and NetBSD (no xattrs/ACLs support or binaries yet)
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* Cygwin (not supported, no binaries yet)
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**Free and Open Source Software**
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* security and functionality can be audited independently
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* licensed under the BSD (3-clause) license
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Easy to use
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-----------
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Initialize a new backup repository and create a backup archive::
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$ borg init /mnt/backup
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$ borg create /mnt/backup::Monday ~/Documents
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Now doing another backup, just to show off the great deduplication::
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$ borg create --stats -C zlib,6 /mnt/backup::Tuesday ~/Documents
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Archive name: Tuesday
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Archive fingerprint: 387a5e3f9b0e792e91c...
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Start time: Tue Mar 25 12:00:10 2014
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End time: Tue Mar 25 12:00:10 2014
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Duration: 0.08 seconds
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Number of files: 358
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Original size Compressed size Deduplicated size
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This archive: 57.16 MB 46.78 MB 151.67 kB <--- !
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All archives: 114.02 MB 93.46 MB 44.81 MB
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For a graphical frontend refer to our complementary project `BorgWeb <https://borgbackup.github.io/borgweb/>`_.
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Links
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=====
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* `Main Web Site <https://borgbackup.readthedocs.org/>`_
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* `Releases <https://github.com/borgbackup/borg/releases>`_
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* `PyPI packages <https://pypi.python.org/pypi/borgbackup>`_
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* `ChangeLog <https://github.com/borgbackup/borg/blob/master/CHANGES.rst>`_
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* `GitHub <https://github.com/borgbackup/borg>`_
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* `Issue Tracker <https://github.com/borgbackup/borg/issues>`_
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* `Bounties & Fundraisers <https://www.bountysource.com/teams/borgbackup>`_
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* `Mailing List <https://mail.python.org/mailman/listinfo/borgbackup>`_
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* `License <https://borgbackup.github.io/borgbackup/authors.html#license>`_
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Notes
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-----
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Borg is a fork of `Attic`_ and maintained by "`The Borg collective`_".
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.. _Attic: https://github.com/jborg/attic
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.. _The Borg collective: https://borgbackup.readthedocs.org/en/latest/authors.html
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Differences between Attic and Borg
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Here's a (incomplete) list of some major changes:
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* more open, faster paced development (see `issue #1 <https://github.com/borgbackup/borg/issues/1>`_)
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* lots of attic issues fixed (see `issue #5 <https://github.com/borgbackup/borg/issues/5>`_)
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* less chunk management overhead via --chunker-params option (less memory and disk usage)
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* faster remote cache resync (useful when backing up multiple machines into same repo)
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* compression: no, lz4, zlib or lzma compression, adjustable compression levels
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* repokey replaces problematic passphrase mode (you can't change the passphrase nor the pbkdf2 iteration count in "passphrase" mode)
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* simple sparse file support, great for virtual machine disk files
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* can read special files (e.g. block devices) or from stdin, write to stdout
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* mkdir-based locking is more compatible than attic's posix locking
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* uses fadvise to not spoil / blow up the fs cache
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* better error messages / exception handling
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* better logging, screen output, progress indication
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* tested on misc. Linux systems, 32 and 64bit, FreeBSD, OpenBSD, NetBSD, Mac OS X
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Please read the `ChangeLog`_ (or ``CHANGES.rst`` in the source distribution) for more
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information.
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BORG IS NOT COMPATIBLE WITH ORIGINAL ATTIC (but there is a one-way conversion).
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EXPECT THAT WE WILL BREAK COMPATIBILITY REPEATEDLY WHEN MAJOR RELEASE NUMBER
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CHANGES (like when going from 0.x.y to 1.0.0).
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NOT RELEASED DEVELOPMENT VERSIONS HAVE UNKNOWN COMPATIBILITY PROPERTIES.
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THIS IS SOFTWARE IN DEVELOPMENT, DECIDE YOURSELF WHETHER IT FITS YOUR NEEDS.
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Borg is distributed under a 3-clause BSD license, see `License`_
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for the complete license.
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|doc| |build| |coverage|
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.. |doc| image:: https://readthedocs.org/projects/borgbackup/badge/?version=stable
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:alt: Documentation
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:target: https://borgbackup.readthedocs.org/en/stable/
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.. |build| image:: https://travis-ci.org/borgbackup/borg.svg
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:alt: Build Status
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:target: https://travis-ci.org/borgbackup/borg
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.. |coverage| image:: https://codecov.io/github/borgbackup/borg/coverage.svg?branch=master
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:alt: Test Coverage
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:target: https://codecov.io/github/borgbackup/borg?branch=master
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.. |screencast| image:: https://asciinema.org/a/28691.png
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:alt: BorgBackup Installation and Basic Usage
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:target: https://asciinema.org/a/28691?autoplay=1&speed=2
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