From LQWiki

This is a list of backup applications for use with linux.

• amanda - full-featured network backup system for tapes, disks and optical media for Linux/Unixes/Mac/Windows
• backuppc - linux/windows backup to disk
• bacula - linux/mac/windows network backup
• dar
• dirvish - rotating disk-to-disk backup using hard links
• mondorescue
• hdup - back up to another hard disk or another machine
• rdiff-backup
• Unison

Low-level programs and file formats for archives:

• ar - archiving file format
• cpio
• dd - not good for a routine backup, but sometimes useful
• rsync - efficient network copy command
• tar