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7.2 KiB
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183 lines
7.2 KiB
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|screencast|
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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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A chunk is considered duplicate if its id_hash value is identical.
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A cryptographically strong hash or MAC function is used as id_hash, e.g.
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(hmac-)sha256.
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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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* Linux Subsystem of Windows 10 (not supported)
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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, see `License`_ for the
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complete 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 /path/to/repo
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$ borg create /path/to/repo::Saturday1 ~/Documents
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Now doing another backup, just to show off the great deduplication::
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$ borg create -v --stats /path/to/repo::Saturday2 ~/Documents
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-----------------------------------------------------------------------------
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Archive name: Saturday2
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Archive fingerprint: 622b7c53c...
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Time (start): Sat, 2016-02-27 14:48:13
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Time (end): Sat, 2016-02-27 14:48:14
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Duration: 0.88 seconds
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Number of files: 163
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-----------------------------------------------------------------------------
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Original size Compressed size Deduplicated size
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This archive: 6.85 MB 6.85 MB 30.79 kB <-- !
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All archives: 13.69 MB 13.71 MB 6.88 MB
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Unique chunks Total chunks
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Chunk index: 167 330
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-----------------------------------------------------------------------------
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For a graphical frontend refer to our complementary project `BorgWeb <https://borgweb.readthedocs.io/>`_.
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Helping, Donations and Bounties
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-------------------------------
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Your help is always welcome!
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Spread the word, give feedback, help with documentation, testing or development.
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You can also give monetary support to the project, see there for details:
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https://borgbackup.readthedocs.io/en/stable/support.html#bounties-and-fundraisers
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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>`_ and
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`ChangeLog <https://github.com/borgbackup/borg/blob/master/docs/changes.rst>`_
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* `GitHub <https://github.com/borgbackup/borg>`_ and
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`Issue Tracker <https://github.com/borgbackup/borg/issues>`_.
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* `Web-Chat (IRC) <http://webchat.freenode.net/?randomnick=1&channels=%23borgbackup&uio=MTY9dHJ1ZSY5PXRydWUa8>`_ and
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`Mailing List <https://mail.python.org/mailman/listinfo/borgbackup>`_
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* `License <https://borgbackup.readthedocs.org/en/stable/authors.html#license>`_
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* `Security contact <https://borgbackup.readthedocs.io/en/latest/support.html#security-contact>`_
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Compatibility notes
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-------------------
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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 or from 1.x.y to 2.0.0).
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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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Security issues should be reported to the `Security contact`_ (or
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see ``docs/suppport.rst`` in the source distribution).
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.. start-badges
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|doc| |build| |coverage| |bestpractices| |bounties|
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.. |bounties| image:: https://api.bountysource.com/badge/team?team_id=78284&style=bounties_posted
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:alt: Bounty Source
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:target: https://www.bountysource.com/teams/borgbackup
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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://api.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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.. |bestpractices| image:: https://bestpractices.coreinfrastructure.org/projects/271/badge
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:alt: Best Practices Score
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:target: https://bestpractices.coreinfrastructure.org/projects/271
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.. end-badges
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