Scanning and previously scanned files with new creation date/archive bit set?

Since NIS09 seems to remember that it has already scanned files previously … what happens in this scenario?

I periodically copy 30Gb of data across the network from my desktops to my laptop.  For the most part, 99.9% of the files are unchanged.  However, being copied to the laptop results in the file creation times and archive bit being reset.  Does NIS09 consider these to be new files needing to be rescanned or are they seen as unchanged files which can be skipped as they were already scanned in the past?

Thanks.