Encrypted bandwidth-efficient backup using the rsync algorithm
Duplicity backs directories by producing encrypted tar-format volumes and uploading them to a remote or local file server. Because duplicity uses librsync, the incremental archives are space efficient and only record the parts of files that have changed since the last backup. Because duplicity uses GnuPG to encrypt and/or sign these archives, they will be safe from spying and/or modification by the server.
The duplicity package also includes the rdiffdir utility. Rdiffdir is an extension of librsync's rdiff to directories---it can be used to produce signatures and deltas of directories as well as regular files. These signatures and deltas are in GNU tar format.
Duplicity is fairly mature software. As any software, it may still have a few bugs, but will work for normal usage and is in use now for large personal and corporate backups. If you have questions try the mailing list. Bug reports and bug fixes can be entered through the Launchpad project page.
In theory many protocols for connecting to a file server could be supported; so far
- Amazon S3
- Backblaze B2
- Google Docs
- Google Drive
- local filesystem
- Microsoft Azure
- Microsoft Onedrive
- Rackspace Cloudfiles
The current stable release is 0.7.12, released Mar 21, 2017.
- Tarball: duplicity-0.7.12.tar.gz
The last 0.6-series stable release is 0.6.26, released May 6, 2015. Please Note: The 0.6 series has been deprecated and the 0.6.26 release is the last release of the series that received additions or enhancements. The stable release is now the 0.7 series. Most long term support distributions are stuck on the 0.6 series. It is strongly recommended that you manually upgrade using the tarball above, or one of the PPA's below.
Warning: If you are upgrading from your distribution's repository to the tarball version, or from the tarball version to your distributions version, please be sure to remove or purge the distribution's version of duplicity. Failure to do so may result in confusing results since the repository and tarball versions may install in different locations.
Older versions are also available for the budding historians in the downloads area.
Michael Terry maintains the duplicity Releases PPA and the duplicity Daily PPA for duplicity and deja-dup PPA for deja-dup. Updates to the PPA will sometimes lag behind the above updates, so please be patient.
Edgar Soldin maintains duply (formerly known as ftplicity), a shell front end that simplifies the usage by keeping settings for backup jobs in profiles. It supports pre/post backup scripts and executing multiple commands in a batch mode.
Duplicity requires a POSIX-like operating system. It is best used under GNU/Linux. Refer to the README for the full list of requirements.