No the directory doesn't have any changing data. It's just a directory of photos saved from my iPhone early last year. The files aren't changing - if something is changing it is block info related to windows dedupe. I'm using this directory as an example, because the server volume is 12TB and it doesn't match any of it - my backup media set is now up to 40TB because of this problem. I backed up once, on retrospect version 11, then ran the script a 2nd time, and it seemed to backup everything again, so I upgraded to version 12.5 (and upgraded the windows client) and ran it a third time, and everything backed up yet again... so I started testing with this single directory until I get it straightened out.