A little while ago I finally got around to bringing order to the mess called my photo library. They were scattered across multiple machines, disks and SD cards. First thing’s first - I moved all files to one place so it’s easier to work with. In retrospect, I’m glad I did this clean up on my nVME disk - this saved me quite a bit of time.
DISCLAIMER Some of the tools discussed here can delete/overwrite files you didn't intend when used incorrectly.