automates the process of creating an rdiff-backup or rsync backup
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.
SBackup is a Simple Backup solution for Linux. It is generally developed with a Gnome desktop in mind, but will also work in other desktop environments and also on the console.
HOWTO: Backup and Sync with Unison
Make long term backups of OpenPGP keys by printing only the secret bits on paper.
Explains a backup-strategy using rsync and hard-links. My choice to go. (use --link-dest!)