http://www.tldp.org/HOWTO/Linux-Complete-Backup-and-Recovery-HOWTO How to back up your system to support a bare-metal recovery.
http://www.tldp.org/LDP/sag/html The Linux System Administration Guide. See Chapter 12 on backups.
http://www.tldp.org/HOWTO/Ext2fs-Undeletion.html Undeleting files from an Ext2/3 file system.
http://tldp.org/HOWTO/Software-RAID-HOWTO.html Learn about software-based RAID arrays in Linux.
http://amanda.sourceforge.net The Amanda home page.
http://www.backupcentral.com Storage Mountain. Much information and links on backups and other storage-related issues.
http://linuxgazette.net/104/odonovan.html An excellent and easy-to-understand article on using rsync and cron for automated backups.
http://www.k3b.org The home of K3b, the KDE CD/DVD burning tool.
http://richard.jones.name/google-hacks/gmail-filesystem/gmail-filesystem.html The GMailFS program, which allows you to convert your gigabyte of Gmail storage into a working Linux file system.
http://www.bluehaze.com.au/unix/cdbkup.html Using a shell script to back up to CD.
http://www.mondorescue.org A rescue tool that can produce bootable CDs to restore a broken system.