SuperDuper! is pretty clear about what it's going to do. If it says it's going to erase it, it's going to erase it. There's a whole chapter in the User's Guide about how to store a backup alongside other files on a destination drive... but it's generally best to buy another drive if you already have a lot of files on the drive... that'll let you back *them* up to (to their own partition, of course).
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--Dave Nanian
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