MacDevCenter on Backup 3
Derrick Story has an article up at MacDevCenter called How to Set Up Backup 3 and Save Your Data: "Combined with a hefty 1GB of online storage, Backup 3 provides .Mac subscribers with a robust, easy-to-use workflow for protecting their most valuable data. In this tutorial, Derrick Story shows you how to get the most out of version 3, using both your iDisk and DVDs for preserving your work."
In the past, I've simply used Carbon Copy Cloner to make all my backups; however, as I'm currently trying to reinvent myself as a brand new Mac user, I think I'll give these instructions a whirl and see how it goes. Need to try out this plugin too.