Dird (5/21/2013)
Edit: My guess is that it wouldn't be an issue besides the fact that msdb would continue to grow slightly (since the backup list isn't maintained); is this right?
I schedule a job on all my instances to delete old backupsets so msdb does not have this type of buildup of old data:
DECLARE @dt DATETIME ;
SET @dt = DATEADD(day, -60, GETDATE())
EXEC msdb.dbo.sp_delete_backuphistory
@oldest_date = @dt ;
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