I’ll have to reinstall it to remind myself what it was, if I recall correctly it was not easy to work out what I needed to do, as I simply wanted to say scan everything for duplicates that are in the (directory hierarchy e.g. multimedia/photos/) I have deemed as being the source of truth)…

Thanks @CrappyTan69 - I ideally need this to run on my NAS, and if possible be opensource/free - looks like for what I’d need Double Killer for, it’s £15/$20 - maybe an option as a last resort…