Super Duper may be good for a hacintosh, but Time Machine does work in some of the distros. Zeph's 10.5.1 is the only one that I haven't gotten Time Machine to work on. Otherwise I've had no problem using it. Works great for me since I do a lot of testing and (sometimes purposely) screwing up my systems to allow myself to get right back to a working system. Of course Disk Utility is a big help with this as well.

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