SuperDuper! preserves the spotlight information on the backup. However, Spotlight is sensitive to the path to the data. Since when the data is indexed on the backup it's in a different location than it would be when restored, it'll generally need to be reindexed.
You can, of course, tell Spotlight to not index the backup by adding the backup drive to the Spotlight Preference Pane's "Privacy" tab.
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--Dave Nanian
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