Hi Dch48,
Maybe you have not thought about this, but technology has overtaken us now. Say that you work on a machine, that machine has leaking condensators and this has ruined the old Mobo beyond repair, wouldn't you need your back-ups then?
Answer no, because you can have the hard-disk restored as a peripheral for a few bucks encased with its own USB plug and feed and hang it undo a new computer (have to re-own the data again with Vista or W7 but still have all your data), in the case of SafeHex and without a destructive virus infection then maybe you should not need back-ups, but I still have a back-up on a usb stick (8 GB is enough for incrementals),
polonus