Unix/Linux Backup Strategies (Some useful links)

g4u - Harddisk Image cloning for PCs. Amazing little software and highly user friendly and very simplistic to use.
http://www.feyrer.de/g4u/

Dirvish, a very fast, disk based, rotating network backup system
http://www.dirvish.org/

Easy Automated Snapshot-Style Backups with Linux and Rsync
http://www.mikerubel.org/computers/rsync_snapshots/

Keith Lofstrom's disk-to-disk backup page (based on dirvish)
http://www.keithl.com/linuxbackup.html

Using Rsync and SSH (This document covers cron, ssh and rsync usage to backup files over a local network or the internet. By using
http://www.jdmz.net/ssh/

Cheap and reliable RAID 5 Network Attached Storage:
http://www.smallnetbuilder.com/content/view/27840/77/1/1/