[dnanian]

There really is no way to make SuperDuper! work "like Time Machine". We won't keep "old versions" of files as a file is changed, even with Copy Newer/Copy Different.

Perhaps the best thing to do, as explained in the User's Guide, is to rotate more than one backup. If you have a daily and a weekly, for example, you'll have files from about a week ago, as well as "today's".

To store files on the same drive as the backup, partition the backup drive into two volumes, an archive/storage partition and a backup.

Definitely don't use Copy Newer or Different if you want a bootable backup. The problem is that files that *should* be deleted to ensure a volume remains bootable won't be, and you'll end up with a big mish-mash of older, deleted and new files.