Just a note to say we’ve been using Shirt pocket’s Super Duper and it’s been working really well. (to a firewire external drive).
We use it to image our boot sector before doing updates. Can be a lifesaver.
And it’s difference copy feature saves a LOT of time on imaging the boot drive.
Anyone not imaging their system prior to updates may want to investigate it. Mostly after the debacle some people went through on that security update that got pulled. 😉
http://www.shirt-pocket.com/SuperDuper