The rule of thumb I use is to always create your image on the newest hardware you have, that way everything you’ve got is covered. When I get in a newer machine after that, I clone my existing image to it via FireWire target mode and then boot the new machine from the OS install disc it came with and upgrade the OS on it. Sometimes it’s necessary to do a clean OS install and fix some applications, but in most cases you’ll be fine.
I worked that way in the OS 8 and 9 days, and haven’t had any problems with it yet in the OS X era.
~Philly
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