Don't worry, I wasn't getting at you or SuperDuper, it's my fault! I've never used the 'Restore' feature of SuperDuper and hopefully never will have to.. I'm assuming it is really just the same as erasing and copying during a normal back-up but the other way around.
My USB back up isn't completely useless I know, as all the files are still there so I'll be able to get to them if disaster strikes (again), but having a bootable back-up is the perfect solution for me... Don't worry I'll get another firewire drive at some point and use the USB drive to store video files on... I've been trying to persuade my wife that we need a drive just for video files for a while!!!
Al.