AllSync & AllDup

When I do a search, does Allup return all files groups within my search parameters that contain duplicates - plus the originals?

So when I go to delete the duplicates, I should retain at least one file in each group as one is likely to be the original?

In "File Manager", should I tick "Do not process groups with all files selected" because one file in every group is likely to be an original?

Many thanks in advance