You are definitely confused, Voix.
Neither Smart Update nor Copy Different - nor anything else in SD! - updates "on the fly" this way.
What you're probably doing is "opening" the backup drive, and then using one of the various buttons in the Finder Sidebar to open Movies, Music, or whatever.
These buttons always open that folder on the original drive, not the backup. So, you're simply looking at the source again...
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--Dave Nanian
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