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Deduplicating archiver with compression and authenticated encryption.

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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 the

installation manual
_ or, if you have already downloaded Borg,
to get started with Borg. There is also an
offline documentation
_ available, in multiple formats.

.. _installation manual: .. _offline documentation:

Main features ~~~~~~~~~~~~~

Space efficient storage Deduplication 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 idhash value is identical. A cryptographically strong hash or MAC function is used as idhash, 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.

Speed * performance-critical code (chunking, compression, encryption) is implemented in C/Cython * local caching of files/chunks index data * quick detection of unmodified files

Data encryption All data can be protected using 256-bit AES encryption, data integrity and authenticity is verified using HMAC-SHA256. Data is encrypted clientside.

Obfuscation Optionally, borg can actively obfuscate e.g. the size of files / chunks to make fingerprinting attacks more difficult.

Compression All 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 backups Borg 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 filesystems Backup 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 platforms We offer single-file binaries that do not require installing anything - you can just run them on these platforms:

* Linux
* Mac OS X
* FreeBSD
* OpenBSD and NetBSD (no xattrs/ACLs support or binaries yet)
* Cygwin (experimental, no binaries yet)
* Linux Subsystem of Windows 10 (experimental)

Free and Open Source Software * security and functionality can be audited independently * licensed under the BSD (3-clause) license, see

_ for the complete license

Easy to use ~~~~~~~~~~~

Initialize a new backup repository (see

borg init --help
for encryption options)::
$ borg init -e repokey /path/to/repo

Create a backup archive::

$ borg create /path/to/repo::Saturday1 ~/Documents

Now doing another backup, just to show off the great deduplication::

$ borg create -v --stats /path/to/repo::Saturday2 ~/Documents
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  

For a graphical frontend refer to our complementary project


Helping, Donations and Bounties, becoming a Patron

Your 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:


  • Main Web Site 
  • Releases 
    PyPI packages 
  • Offline Documentation 
  • GitHub 
    _ and
    Issue Tracker 
  • Web-Chat (IRC) 
    _ and
    Mailing List 
  • License 
  • Security contact 

Compatibility notes

EXPECT 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).



Security issues should be reported to the

Security contact
_ (or see
in the source distribution).

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.. _installation:

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