Answer by Kent Chenery for SQL Server Restore from one database to another
"It just does". Its just meta data about the backup. The Books Online article http://msdn.microsoft.com/en-us/library/ms186299.aspx hints at it, albeit not very well in the "Remarks" section. From that...
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One of our devs backed up a dev database, and then restored it in production. It's a new database for a new app that was deployed last night intentionally to prod. Now in the backupset table...
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