It is nice being thick.
As a techie thicko I sometimes have techie problems. Reading this exchange, I am now glad that I am a techie thicko. My 13,000 or thereabouts piccies may have a few duplicates.
I have a simple system in Win filing. Named, dated and "clean" files are in "family photos". Less clean, unsorted, maybe duplicated files are in "family photos spares".
I might well be wrong, but I do not trust software to do the sorting. So every now and then, swmbo and I sit down to clean a few files, and transfer them as we can. F knows why we have so many files called Moiras or some other mis-spelt name. As bogu says, back ups and disorganised changes over time create issues.
Then, one good thing about BT. The second, off site, back up to the sorted photos is a free BT back up. BUT......f-ing BT make keeping the nice clean files a real pain......So one day I'll be back at the beginning. Or the kids will be.