I had sent an email to Shirt Pocket site, for clarification about the free version. This is what I got as reply :
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The download is the same. You can use the unregistered version to make full backups of both 'all' and 'user' files, without expiration, and with support. Features like "Smart Update" and scheduling are unlocked when you pay to register.
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So, yes, SuperDuper can be used for free, without registering it, but some features won't be available.