s.a. http://forum.xda-developers.com/showthread.php?t=2011811
TEBE is a backup extension for the Mozilla Thunderbird email client. It is functionally very similar to the Firefox FEBE backup extension.
Camlistore is: a way to store, sync, share, model and back up content a work in progress Open Source (Apache licensed)
Tartarus provides a nice wrapper around basic Unix tools such as tar, find and curl (well, that's not that basic) to provide a seamless backup solution, aimed at automatic gathering and backup. It has the ability to do full as well as incremental backups
Back In Time is a simple backup tool for Linux inspired from “flyback project†and “TimeVaultâ€. The backup is done by taking snapshots of a specified set of directories.