Hardcoded dupeGuru

(strangely, although this is a commonly recurring feature request, I had never added a ticket for it)

from email:

The idea here is that I have lots of varied backups on different drives from different dates on different computers and I want to work through all the data to create a new reference volume. What happens is that the user's volumes and backups end up getting a few variations stored on them and I want to be able to easily find the variants and then copy them into the reference directory.

Since my users tend to make partial backups on different days, then they run out of space, I need to clean up computers and resync backup volumes.

The functionality I am looking for is the ability to make the duplicates invisible and then show all non-duplicates on the non-reference volume. (this would be similar to your "Dupes Only" feature) I do not need to see the files in the reference volume, all of them can stay invisible, I need to see only the non matches or non-duplicates on the non-reference volume.
Then I want to be able to select some or all those and copy them into the reference volume So after a final scan where everything I want copied is copied to the reference volume I want to make sure that I have everything backed up so I can safely delete it or confirm that the second backup is correct and complete.

Perhaps I should just trust the situation and use your software to delete the files then review the remainder, but before I do that I am looking for a non-destructive alternative that will allow me to organize and sort things out so that I can maintain the computer and secondary backup drives.

The idea is to have an option to, instead of showing duplicates, show non duplicates. For that to work, we need at least one reference folder. The biggest problem is to figure out an elegant way to present the feature, UI-wise.