Obnam

Obnam is an easy, secure backup program. Backups can be stored on local hard disks, or online via the SSH SFTP protocol. The backup server, if used, does not require any special software, on top of SSH.

Some features that may interest you:

• Snapshot backups. Every generation looks like a complete snapshot, so you don't need to care about full versus incremental backups, or rotate real or virtual tapes.
• Data de-duplication, across files, and backup generations. If the backup repository already contains a particular chunk of data, it will be re-used, even if it was in another file in an older backup generation. This way, you don't need to worry about moving around large files, or modifying them. (However, the current implementation has some limitations: see dedup).
• Encrypted backups, using GnuPG.

Obnam development has ceased, but the author has started a re-write called Obnam2 (not yet ready for use): https://obnam.org/