Want to find a free and automatic way on backing up your files in Mac? MacDevCenter has introduced one for Tiger (OS X 10.4) to backup your data without any user interaction after has it setup. It involves rsync command, AppleScript, and iCal:
… In this article I'm going to show you how to create a free, customizable backup solution using only software that comes with Mac OS X 10.4, which will automatically back up changes to your data without user intervention.
To use this solution, you should back up to an external firewire hard drive or to a network volume. Do not attempt to back up to a CD or DVD drive or to an internal hard drive. Removable media, such as DVDs, do not have enough storage space to back up modern hard drives. Backing up to an internal drive is unsafe because anything that destroys your internal data would probably destroy the backup as well. An external firewire drive with a capacity greater than your internal drive is an effective backup storage device…
Automated Backups on Tiger Using rsync – [MacDevCenter]