So I was delighted when I recently discovered I could buy 500GB and 750GB external FireWire hard drives for under $200, and assumed I could simply format them into multiple boot-volume-sized partitions into which I could place clones, as I had so often and easily in the past. In fact I like to not only keep a most recent clone, but several historical ones as well. I'm a big fan of using SuperDuper (or CarbonCop圜loner or even Disk Utility) to make bootable clones of my startup volume as an important part of my backup strategy.