mirror of https://github.com/borgbackup/borg.git
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7.5 KiB
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211 lines
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This is borg2!
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--------------
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Please note that this is the README for borg2 / master branch.
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borg2 is currently in beta testing.
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For the stable version's docs, please see there:
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https://borgbackup.readthedocs.io/en/stable/
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TODO: the screencasts need a remake using borg2, see there:
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https://github.com/borgbackup/borg/issues/6303
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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 back up 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 targets not
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fully trusted.
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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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There is also an `offline documentation`_ available, in multiple formats.
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.. _installation manual: https://borgbackup.readthedocs.org/en/stable/installation.html
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.. _offline documentation: https://readthedocs.org/projects/borgbackup/downloads
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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 client-side using 256-bit authenticated encryption
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(AES-OCB or chacha20-poly1305), ensuring data confidentiality, integrity and
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authenticity.
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**Obfuscation**
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Optionally, borg can actively obfuscate e.g. the size of files / chunks to
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make fingerprinting attacks more difficult.
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**Compression**
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All data can be optionally compressed:
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* lz4 (super fast, low compression)
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* zstd (wide range from high speed and low compression to high compression
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and lower speed)
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* zlib (medium speed and compression)
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* 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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* macOS
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* FreeBSD
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* OpenBSD and NetBSD (no xattrs/ACLs support or binaries yet)
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* Cygwin (experimental, no binaries yet)
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* Linux Subsystem of Windows 10 (experimental)
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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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For ease of use, set the BORG_REPO environment variable::
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$ export BORG_REPO=/path/to/repo
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Create a new backup repository (see ``borg rcreate --help`` for encryption options)::
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$ borg rcreate -e repokey-aes-ocb
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Create a new backup archive::
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$ borg create Monday1 ~/Documents
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Now doing another backup, just to show off the great deduplication::
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$ borg create -v --stats Monday2 ~/Documents
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Repository: /path/to/repo
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Archive name: Monday2
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Archive fingerprint: 7714aef97c1a24539cc3dc73f79b060f14af04e2541da33d54c7ee8e81a00089
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Time (start): Mon, 2022-10-03 19:57:35 +0200
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Time (end): Mon, 2022-10-03 19:57:35 +0200
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Duration: 0.01 seconds
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Number of files: 24
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Original size: 29.73 MB
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Deduplicated size: 520 B
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Helping, Donations and Bounties, becoming a Patron
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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://www.borgbackup.org/support/fund.html
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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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* `Offline Documentation <https://readthedocs.org/projects/borgbackup/downloads>`_
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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) <https://web.libera.chat/#borgbackup>`_ 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/support.rst`` in the source distribution).
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.. start-badges
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|doc| |build| |coverage| |bestpractices|
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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://github.com/borgbackup/borg/workflows/CI/badge.svg?branch=master
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:alt: Build Status (master)
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:target: https://github.com/borgbackup/borg/actions
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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_basic| image:: https://asciinema.org/a/133292.png
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:alt: BorgBackup Basic Usage
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:target: https://asciinema.org/a/133292?autoplay=1&speed=1
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:width: 100%
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.. _installation: https://asciinema.org/a/133291?autoplay=1&speed=1
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.. _advanced usage: https://asciinema.org/a/133293?autoplay=1&speed=1
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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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