Its very nice. I use -Sr1 so I can then pull into a spreadsheet and look at the files and decide which one I want to keep.
DupeGuru
I personally use rdfind as it has an option to replace duplicates with hardlinks instead of deleting them outright (if on the same filesystem). This is useful if you do still need a file to exist at multiple paths.
I then use Czkawka for everything else, especially for similar, non-duplicate files.
Ooh, that's smart! Thanks for the recommendation.
Do you want something that runs on your NAS or from another computer? What OS(es) are you using?
https://github.com/qarmin/czkawka
Thank you for the suggestion, I'll look into it.