Just noticed this:
Painless disk cloning - Just a quick plug for SuperDuper which may end up joining DiskWarrior as my must-have Mac utility. It does exactly two things very well: a) it creates bootable DMG clones of Mac disks and b) it lets you very easily update the disk images using boilerplate or customized scripts. Part 1 has historically been the domain of Carbon Copy Cloner — a great little app. One thing SuperDuper adds is a simple interface for scripting the items/folders you do and don’t want to clone as well as how you want them to behave (new vs. changed, etc.). This basically means you now have a perfect copy of your drive that can be restored very easily in case of calamity. Ditto for doing a “safety clone” before you install a bunch of dicey system upgrades. Highly recommended utility.
via 43 Folders: Thanks, Merlin! (and don’t miss Merlin’s classic 5ives, either!)