I have just started using Super Duper - so far so good. The basic version that will clone is free to download. Nice interface, good manual, too.
We like SuperDuper quite a bit, and if you want to read something pretty interesting on the various tols out there for "cloning" Mac OS X volumes then follow this link:http://blog.plasticsfuture.org/2006/03/05/the-state-of-backup-and-cloning-tools-under-mac-os-x/
Most service providers and technicians are now adopting Super Duper as their tool of choice. Although we'll still use Carbon Copy Cloner if the source drive is having problems (like bad sectors, etc). CCC will skirt around bad sectors if it can, wheras SuperDuper will just stall.
And as Peter suggests, definitely test your clones to make sure they're working right!
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