Synchronization and backup programs

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This page lists and compares applications that synchronize data between two or more locations, and those that build on top of such functionality to make incremental copies of important data for backup purposes. Because of their relationship, the two groups share several traits that justify describing them in the same article.

Backup overview

Having backups of important data is a necessary measure to take, since human and machine processing errors are very likely to generate corruption as time passes, and also the physical media where the data is stored is inevitably destined to fail. In order to choose the best program for one's own needs, the following aspects should be considered:

  • The type of backup medium that is going to store the data, e.g. CD, DVD, remote server, external hard drive, etc.
  • The planned frequency of backups, e.g. daily, weekly, monthly, etc.
  • The features expected from the backup solution, e.g. compression, encryption, handles renames, etc.
  • The planned method to restore backups if needed.

Data synchronization

These applications simply keep directories synchronized between multiple locations/machines, in a "mirror" fashion. Nonetheless, most of them still allow storing and reverting to old revisions of modified or deleted files.

See also Wikipedia:Comparison of file synchronization software.

Legend:

  • Name: the application name, linking to the official website.
  • Installation: a link to the main ArchWiki article, if existing, or directly to the package pages.
  • Implementation: the programming language, library, or utility that the application is based on.
  • Delta transfer: only the modified parts of files are transferred.
  • Encrypted transfer: data is encrypted by default when transferred over the network.
  • FS metadata: file system permissions and attributes are synchronized.
  • Resumable: the synchronization can be resumed without restarting it if interrupted.
  • Handles renames: moved/renamed files are detected and not stored or transferred twice; it typically means that a checksum is computed for files or chunks thereof.
  • Version control: the old version of files are backed up (reverse incremental backup).
  • Conflict resolution: the application handles file conflicts, either automatically or interactively, i.e. it does not silently discard conflicting files.
  • Multidirectional: more than 2 locations can be kept in sync together.
  • FS monitoring: the application listens to file system events to trigger the synchronization.
  • CLI: the application is command-line driven, i.e. it is scriptable.
  • Other interfaces: the application has the specified user interfaces, e.g. GUI, TUI, or web-based.
  • Licence: the licence of the server and client applications.
  • Other platforms: supported operating systems other than Linux.
  • Active: whether the project is currently maintained.
  • Specificity: brief notes about special features that notably set the application apart from the others.

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Reason: Enter values in the cells marked with "?". Also replace the "Yes" with more specific values and references. (Discuss in Talk:Synchronization and backup programs#)
Name Installation Implementation Delta transfer Encrypted transfer FS metadata Resumable Handles renames Version control Conflict resolution Multidirectional FS monitoring CLI Other interfaces Licence Other platforms Active Specificity
BitTorrent Sync BitTorrent Sync Closed source Yes  ?  ?  ?  ?  ?  ?  ?  ? No Web Proprietary freemium OS X, Windows, Android, iOS, Windows Phone, Amazon Kindle Fire, FreeBSD Yes
FreeFileSync freefilesyncAUR C++  ? SFTP [1]  ?  ? Yes [2] Yes [3]  ? No  ? No Yes GPL Windows, OS X Yes
git-annex git-annex Haskell, git rsync [4] rsync [5]  ?  ?  ? Yes  ? git remotes [6]  ? Yes git-annex assistant GPLv3 OS X, Android Yes
Grsync grsync rsync front-end rsync rsync  ?  ?  ?  ?  ? No  ? No GTK+ GPLv2  ?
gutbackup gutbackupAUR rsync wrapper rsync rsync  ?  ?  ?  ?  ? No  ? Yes No MIT  ?
Jotasync not packaged? search in AUR Java gui for rsync rsync rsync  ?  ?  ?  ?  ? No  ? limited Swing Apache v2 OS X, Windows Yes Integrated scheduler.
luckyBackup luckybackupAUR C++ rsync [7] rsync [8]  ?  ?  ? Yes  ? No  ? limited [9] Qt GPLv3 frozen [10]
osync.sh not packaged? search in AUR Shell rsync rsync  ? Yes  ? Yes  ? No optional [11] Yes No BSD Yes
rdiff-backup rdiff-backup Python 2 Yes Yes Yes  ? No Yes preview changes No No Yes No GPL Win32  ?
rsync rsync C Yes SSH or native protocol Yes Yes No
  • --link-dest with hard links [12]
  • --backup
preview changes No No Yes grsync GPLv3 Win32 Yes Standard install on all Linux distributions.
SparkleShare sparkleshare C#  ?  ?  ?  ?  ?  ?  ?  ?  ? No Yes GPLv3 Windows, OS X  ?
Syncthing Syncthing Go Yes [13] Yes [14] partial [15]  ?  ? Yes [16] renames one file [17] Yes  ? No Web, GTK MPL v2 Windows, OS X, Android, BSD, Solaris Yes
Synkron synkronAUR C++  ?  ?  ?  ?  ?  ?  ? Yes  ? No Qt GPLv2 Windows, OS X  ?
taskd Taskd C++, python, Yes Yes  ? Yes  ?  ?  ? Yes No Yes No MIT Android Yes
Unison Unison OCaml Yes Yes partial [18] optional [19] No Yes [20] interactive No No Yes GTK2 GPL Windows, OS X, FreeBSD, Android Yes [21]
Name Installation Implementation Delta transfer Encrypted transfer FS metadata Resumable Handles renames Version control Conflict resolution Multidirectional FS monitoring CLI Other interfaces Licence Other platforms Active Specificity

Incremental backups

Applications that can do incremental backups remember and take into account what data has been backed up during the last run (so-called "diffs") and eliminate the need to have duplicates of unchanged data. Restoring the data to a certain point in time would require locating the last full backup and all the incremental backups from then to the moment when it is supposed to be restored. This sort of backup is useful for those who do it very often.

See also Dotfiles#Version control.

Legend:

  • Name: the application name, linking to the official website.
  • Installation: a link to the main ArchWiki article, if existing, or directly to the package pages.
  • Implementation: the programming language, library, or utility that the application is based on.
  • Compressed storage: compression is used for storage.
  • Encrypted storage: encryption is used for storage.
  • Delta transfer: only the modified parts of files are transferred.
  • Encrypted transfer: data is encrypted by default when transferred over a network.
  • FS metadata: file system permissions and attributes are backed up.
  • Easy access: the backup is stored plainly in the file system, or is mountable as such.
  • Resumable: the backup can be resumed without restarting it if interrupted.
  • Handles renames: moved/renamed files are detected and not stored or transferred twice; it typically means that a checksum is computed for files or chunks thereof.
  • CLI: the application is command-line driven, i.e. it is scriptable.
  • Other interfaces: the application has the specified user interfaces, e.g. GUI, TUI, or web-based.
  • Licence: the licence of the server and client applications.
  • Other platforms: supported operating systems other than Linux.
  • Active: whether the project is currently maintained.
  • Specificity: brief notes about special features that notably set the application apart from the others.

Single machine

These applications are aimed at backing up data from the machine they are installed on, although the backup destination can be located on an external machine or storage media.

Chunk-based increments

If a file is modified, these applications store only its changed parts at the next snapshot. Compared to #File-based increments applications, these are more space-efficient, especially when large files receive small modifications; on the other hand, the archived snapshots have to be opened with the backup application that created them, since the files have to be reconstructed from the stored binary diffs.

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: Enter values in the cells marked with "?". Also replace the "Yes" with more specific values and references. (Discuss in Talk:Synchronization and backup programs#)
Name Installation Implementation Compressed storage Encrypted storage Delta transfer Encrypted transfer FS metadata Easy access Resumable Handles renames CLI Other interfaces Licence Other platforms Active Specificity
Areca Backup arecaAUR Java Zip, Zip64 AES128, AES256 Yes Yes Yes No Pausing only No Yes Yes GPLv2 Windows Yes
Attic atticAUR Python Yes AES256 Yes SSH Yes Yes Yes Yes Yes No BSD Yes
BorgBackup borg Python (Attic fork) lz4, zlib, lzma AES256 Yes SSH Yes[22] Yes[23] Yes[24] Yes Yes third party BSD *BSD, OS X Yes
btar btarAUR[broken link: archived in aur-mirror] C Yes Yes Yes Yes  ? No  ?  ? Yes No GPLv3 Yes Redundancy, indexed extraction, multicore compression, input and output serialisation, tolerance to partial archive errors.
bup bup bup-gitAUR C, Python, git Yes No Yes Yes Immature Yes[25] pick up where you left off [26] Yes Yes third party GPLv2 Windows, OS X, NetBSD, Solaris Yes Same storage format as git
bups bupsAUR bup frontend Yes No Yes Yes Immature Yes pick up where you left off [27] Yes Yes GTK 3 MIT Yes
Déjà Dup Déjà Dup duplicity front-end Yes Yes Yes Yes  ? No Yes No Yes GTK+ GPLv3 Yes Integrated into GNOME Files.
Duplicati duplicati-latestAUR C# Yes Yes Yes Yes scheduled for 2.0 release No Pausing only No Yes Yes LGPL Windows Yes
Duplicity Duplicity librsync gzip gpg Yes Yes  ? No Yes No Yes Déjà Dup GPL Yes
Duply Duply duplicity front-end Yes Yes Yes Yes  ? No Yes No Yes No GPLv2 Yes
Kup Backup System kup rsync, bup front-end Yes Yes Yes Yes Immature Yes No Yes bup Qt GPLv2 Yes
obnam obnamAUR Python Yes GnuPG Yes Yes  ? Yes checkpoints every 100MB  ? Yes No GPLv3 Yes
ZBackup zbackupAUR C++ LZMA, LZO AES Yes Yes  ? planned [28] No Kinda through tar Yes No GPLv2 Yes Repository consists of immutable files.
Name Installation Implementation Compressed storage Encrypted storage Delta transfer Encrypted transfer FS metadata Easy access Resumable Handles renames CLI Other interfaces Licence Other platforms Active Specificity

File-based increments

If a file is modified, these applications store its new version entirely at the next snapshot. Compared to #Chunk-based increments applications, these are less space-efficient, especially when large files receive small modifications; on the other hand, often the archived snapshots can be opened without the need to have the backup application installed.

Specific legend:

  • Hard links: whether unmodified files are stored as hard links to previous versions.

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: Enter values in the cells marked with "?". Also replace the "Yes" with more specific values and references. (Discuss in Talk:Synchronization and backup programs#)
Name Installation Implementation Compressed storage Encrypted storage Delta transfer Encrypted transfer FS metadata Easy access Resumable Handles renames Hard links CLI Other interfaces Licence Other platforms Active Specificity
Back In Time Back In Time Python, rsync, diff No No rsync rsync rsync Yes No No Yes [29] No Qt GPL Yes
DAR (Disk ARchive) darAUR C++ special archive format Yes  ? Yes  ?  ?  ?  ? No [30] Yes DarGUI GPL Windows, Solaris, FreeBSD, NetBSD, MacOS X Yes Automatic backup using cron is possible with sarabAUR[broken link: archived in aur-mirror].
DarGUI darguiAUR DAR front-end Yes Yes  ? Yes  ?  ?  ?  ? No [31] No GTK GPL Windows  ?
hdup hdup C bzip, gzip, lzop gpg  ? SSH  ? No No No No Yes No GPLv2 No Multiple backup targets.
Link-Backup link-backupAUR Python No No  ? SSH  ?  ? Yes Yes No [32] Yes No MIT No It copies itself to the server.
rdup rdupAUR C tar.gz gpg, blowfish and others  ?  ?  ? Yes  ? No Yes Yes No GPLv3 No Set of command-line tools.
rsnapshot rsnapshot rsync No No Yes Yes  ?  ?  ?  ? Yes [33] Yes No GPLv2 Win32 Yes
sbackup sbackupAUR Python gzip, bzip2 No  ? SSH  ? No No No No No GTK GPLv3 Yes
TimeShift timeshiftAUR rsync No No rsync rsync  ?  ?  ?  ? Yes No GTK GPLv3 Designed for full-system backups to dedicated devices. Yes
Name Installation Implementation Compressed storage Encrypted storage Delta transfer Encrypted transfer FS metadata Easy access Resumable Handles renames Hard links CLI Other interfaces Licence Other platforms Active Specificity

Network oriented

These applications have been designed to centralize the backup of several machines connected to a network, through a server-client model. In general they are more complicated to deploy, compared to #Single machine solutions.

Specific legend:

  • Increment type: the strategy used to reduce used space by deduplicating data (i.e., besides compression).
    • file-based: if a file is modified, the entire new version is stored at each snapshot.
      • hard-links: whether unmodified files are stored as hard links to previous versions.
    • chunk-based: only the modified parts of files are stored at each snapshot.

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: Enter values in the cells marked with "?". Also replace the "Yes" with more specific values and references. (Discuss in Talk:Synchronization and backup programs#)
Name Installation Implementation Compressed storage Encrypted storage Delta transfer Encrypted transfer FS metadata Easy access Resumable Handles renames Increment type CLI Other interfaces Licence Other platforms Active Specificity
BackupPC BackupPC Perl Yes No Yes Yes Yes No Yes  ? file-based, hard links [34] No Web GPLv2 Any (no client needed) Yes Identical files across backups of the same or different clients are stored only once.
Bacula bacula-* in AUR C++ Yes Yes  ? Yes  ?  ? Yes  ? file-based [35] Yes GUI, Web AGPLv3 Windows, OS X Yes
burp burp-backupAUR librsync Yes Yes Yes Yes  ?  ?  ?  ? chunk-based [36] Yes burp-ui AGPLv3 Windows Yes
SafeKeep safekeepAUR rdiff-backup No No  ? Yes  ?  ?  ?  ? chunk-based [37] Yes No GPL No Integrates with LVM and databases to create consistent backups. Bandwidth throttling.
Snebu snebuAUR[broken link: archived in aur-mirror] C Yes No  ? Yes  ?  ?  ?  ?  ? Yes No GPLv3  ? Supports arbitrary retention schedules.
Synbak synbak Multitool wrapper Yes No Yes Yes Yes  ?  ?  ?  ? No Web GPLv3 Yes Unifies several backup methods.
Name Installation Implementation Compressed storage Encrypted storage Delta transfer Encrypted transfer FS metadata Easy access Resumable Handles renames Increment type CLI Other interfaces Licence Other platforms Active Specificity

Cloud storage

Merge-arrows-2.pngThis article or section is a candidate for merging with List of applications#File sharing.Merge-arrows-2.png

Notes: Remove the extra bullet points: the Wikipedia comparison table, and the respective webpages and Wikipedia articles do a better job at describing them. (Discuss in Talk:Synchronization and backup programs#)

Third-party services

See also Wikipedia:Comparison of online backup services.

  • Amazon S3 — Amazon Simple Storage Service (Amazon S3), provides developers and IT teams with secure, durable, highly-scalable object storage. Amazon S3 is easy to use, with a simple web service interface to store and retrieve any amount of data from anywhere on the web. With Amazon S3, you pay only for the storage you actually use. There is no minimum fee and no setup cost.
http://aws.amazon.com/s3/ || s3cmd
  • CloudBacko — Enterprise-grade cloud backup tool for Linux, Mac and Windows.
    • Closed source. Free, Lite and Pro versions available.
    • Written in Java.
    • Encrypted backup to multiple cloud destinations.
    • Supports multiple cloud destinations combined as one storage pool.
    • No installation required in Free version.
    • GUI frontend for Linux in Pro version.
    • Virtual machine backup available in Pro version.
http://www.cloudbacko.com/ || not packaged? search in AUR
  • CrashPlan — An online/offsite backup solution.
    • Unlimited online space for very reasonable pricing.
    • Automatic and incremental backups to multiple destinations.
    • Intuitive GUI.
    • Offers encryption and de-duplication.
    • Software is free for local use.
    • Restore prevents simultaneous backing up
http://www.crashplan.com/ || crashplanAUR
  • Dropbox — A popular file-sharing service.
    • A daemon monitors a specified directory, and uploads incremental changes to dropbox.com.
    • Changes automatically show up on your other computers.
    • Includes file sharing and a public directory.
    • You can recover deleted files.
    • Community written add-ons.
    • Free accounts have 2GB storage.
http://www.dropbox.com || dropboxAUR nautilus-dropboxAUR
  • Google Drive — A file storage and synchronization service provided by Google.
    • Provides cloud storage, file sharing and collaborative editing.
    • Multiple clients are available.
https://drive.google.com || google-drive-ocamlfuseAUR (free), driveAUR (free), griveAUR (free), gdrivefsAUR (free), insync (non-free)
  • iDrive — Universal Online Backup.
    • Multiple Device Backup.
    • Online File Sync.
    • Real-Time Backup.
    • Backup and Access from Mobile Devices.
    • Remote Manage.
    • No GUI Front end for Linux, command line based. A wrapper script is available to make it easier to use.
https://www.idrive.com/ || idevsutilAUR[broken link: archived in aur-mirror], idrive-wrapperAUR[broken link: archived in aur-mirror]
  • Jungle Disk — An online backup tool that stores its data in Amazon S3 or Rackspace Cloud Files.
    • A GNOME Files extension.
    • Only paid plans available.
http://www.jungledisk.com/ || nautilus-junglediskAUR[broken link: archived in aur-mirror]
  • MEGA — Successor to the MegaUpload file-sharing service.
    • Free accounts are 50GB with paid plans available for more space.
    • Offers encryption and de-duplication.
    • Usually accessed through its web interface but other tools exist.
https://mega.co.nz || megatoolsAUR, megasyncAUR, megafuseAUR[broken link: archived in aur-mirror]
  • Nutstore — A cloud service that lets you sync and share files anywhere.
    • Multiple file folders sync.
    • Service for Chinese users.
http://jianguoyun.com/ || nutstoreAUR
  • rsync.net — Cloud storage for offsite backups.
    • ZFS filesystem, accessible with any SSH/SFTP/SCP tool, running on a UNIX system.
    • Simple rsync synchronization with daily automatic ZFS snapshots.
    • Special discounted price if used with borg or attic.
http://www.rsync.net/ || rsync/SSH, borg/atticAUR
  • SpiderOak — An online backup tool for Windows, Mac and Linux users to back up, share, sync, access and store their data.
    • Free account holds 2GB as a 60-day trial.
    • Includes file sharing and a public directory.
    • Incremental backup and sync are both supported.
https://spideroak.com/ || spideroak-oneAUR
  • Storage Made Easy — Provides unified access to numerous cloud storage services, as well as its own storage.
    • Free and paid version available.
    • Free account holds 5GB and allows access to up to three other cloud storage providers.
    • Supports local directory via fuse, as well as web access.
    • Supports many cloud storage services, such as Box, Dropbox, Google Drive, Onedrive, and others.
http://storagemadeeasy.com/ || smestorageAUR[broken link: archived in aur-mirror]
  • Tarsnap — A secure online backup service for BSD, Linux, OS X, Solaris and Windows (through Cygwin).
    • Compressed encrypted backups to Amazon S3 Servers.
    • Automate via cron.
    • Incremental backups.
    • Backup any files or directories.
    • Command line only client.
    • Pay only for usage (bandwidth and storage).
http://www.tarsnap.com || tarsnap
  • Yandex Disk — Free cloud storage service created by Yandex.ru that gives you access to your photos, videos and documents from any internet-enabled device.
https://disk.yandex.ru/ || yandex-diskAUR

Multi-service clients

  • Déjà Dup — A simple GTK+ backup program. It hides the complexity of doing backups the 'right way' (encrypted, off-site, and regular) and uses duplicity as the backend.
    • Automatic, timed backup configurable in GUI.
    • Restore wizard.
    • Integrated into the GNOME Files file manager.
    • Inherits several features of duplicity.
https://launchpad.net/deja-dup || deja-dup
  • Duplicati — Backup client that securely stores encrypted, incremental, compressed backups on cloud storage services and remote file servers. It works with Amazon S3, Windows Live SkyDrive, Google Drive (Google Docs), Rackspace Cloud Files or WebDAV, SSH, FTP (and many more). Duplicati is open source and free.
http://www.duplicati.com/ || duplicati-latestAUR
  • Duplicity — A simple command-line utility which allows encrypted compressed incremental backup to nearly any storage.
    • Supports gpg encryption and signing.
    • Supports gzip compression.
    • Supports full or incremental backups, incremental backup stores only difference between new and old file.
    • Supports pushing over many protocols.
http://www.nongnu.org/duplicity/ || duplicity
  • Duply — Front-end for duplicity which simplifies running it by:
    • keeping recurring settings in profiles per backup job;
    • automated import/export of keys between profile and keyring;
    • enabling batch operations eg. backup_verify_purge;
    • executing pre/post scripts;
    • precondition checking for flawless duplicity operation.
http://www.duply.net/ || duplyAUR
  • rclone — Rclone is a command line program to sync files and directories to and from Google Drive, Amazon S3, Openstack Swift / Rackspace cloud files / Memset Memstore, Dropbox, Google Cloud Storage and The local filesystem.
http://rclone.org/ || rclone

Cooperative

A cooperative storage cloud is a decentralized model of networked online storage where data is stored on multiple computers, hosted by the participants cooperating in the cloud.

  • Symform — A peer-to-peer cloud backup service.
    • Unlimited free backup in exchange for 2:1 storage space contribution with an always-connected device (at least 80% uptime).
    • Payment options exist.
    • First 10GB of backup storage is free (no contribution needed).
    • In addition to paid support, support plans in exchange for extended contribution (300GB+) exist.
    • Automatic and incremental backups.
    • Data is encrypted before leaving the computer, though keys are also stored on the Symform's servers.[38]
    • Customizable limits for bandwidth consumption.
    • Ability to have a local copy ("Hot Copy") of the backed up data on a different disk or computer.
    • Ability to have synchronized folders between nodes (Dropbox-like).
    • Closed source, using mono. Windows clients available.
http://www.symform.com/ || symformAUR[broken link: archived in aur-mirror]

Custom infrastructure

  • Cozy — A personal cloud you can hack, host and delete.
https://cozy.io || cozy-standaloneAUR cozy-nginxAUR cozy-apacheAUR
  • OpenStack — Controls large pools of compute, storage, and networking resources throughout a datacenter, managed through a dashboard or via the OpenStack API. OpenStack works with popular enterprise and open source technologies making it ideal for heterogeneous infrastructure.
http://www.openstack.org/ || not packaged? search in AUR
  • ownCloud — Software suite that provides a location-independent storage area for data.
http://owncloud.org/ || owncloud
  • Pydio — Mature open source web application for file sharing and synchronization.
https://pydio.com/ || pydioAUR
  • Seafile — Open source cloud storage system, with advanced support for file syncing, privacy protection and teamwork.
http://seafile.com/ || seafile-serverAUR seafile-clientAUR seafile-client-cliAUR seafile-client-qt5AUR[broken link: package not found]
  • StackSync — Open-source scalable Personal Cloud that can adapt to the necessities of organizations. It puts a special emphasis on security by encrypting data on the client side before it is sent to the server.
http://stacksync.org/ || not packaged? search in AUR
  • Syncany — Cloud storage and filesharing application with a focus on security and abstraction of storage.
https://www.syncany.org/ || syncanyAUR

Version control systems

Merge-arrows-2.pngThis article or section is a candidate for merging with List_of_applications#Work_environment.Merge-arrows-2.png

Notes: Also drop the extra bullets, the Wikipedia comparison table is much better than this. (Discuss in Talk:Synchronization and backup programs#)

These are traditionally used for keeping track of software development; but if you want to have a simple way to manage your config files in one directory, it might be a good solution.

See also Wikipedia:Comparison of revision control software.

  • Bazaar — A distributed version control system that helps you track project history over time and to collaborate easily with others.
    • Similar commands to Subversion.
    • Supports working with or without a central server.
    • Support for working with some other revision control systems
    • Complete Unicode support.
http://bazaar.canonical.com/en/ || bzr
  • Darcs — A distributed revision control system that was designed to replace traditional, centralized source control systems such as CVS and Subversion.
    • Offline mode.
    • Easy branching and merging.
    • Written in Haskell.
    • Not very fast.
http://darcs.net/ || darcs
  • Git — A distributed revision control and source code management system with an emphasis on speed.
    • Very easy creation, merging, and deletion of branches.
    • Nearly all operations are performed locally, giving it a huge speed advantage on centralized systems.
    • Has a "staging area" or "index", this is an intermediate area where commits can be formatted and reviewed before completing the commit.
    • Does not handle binary files very well.
http://git-scm.com/ || git
  • Mercurial — A distributed version control system written in Python and similar in many ways to Git.
    • Platform independent.
    • Support for extensions.
    • A set of commands consistent with Subversion.
    • Supports tags.
http://mercurial.selenic.com/ || mercurial
  • Subversion — A full-featured centralized version control system originally designed to be a better CVS.
    • Renamed/copied/moved/removed files retain full revision history.
    • Native support for binary files, with space-efficient binary-diff storage.
    • Costs proportional to change size, not to data size.
    • Allows arbitrary metadata ("properties") to be attached to any file or directory.
http://subversion.apache.org/ || subversion

See also