If I wanted to keep a copy on my desktop of the photos on my phone, and organize those photos into several folders, how would I avoid re-copying photos I've already copied?
If I drop all my photos into a single folder, this is trivial: if there is already a file with the same name in the destination folder, then don't copy that one.
But if I drop the photos into multiple folders, that simple check won't work—the photo might have already been copied into a different folder!
What do?
How difficult it gets rather depends on how you are setting up your directories on the destination.
If they aren't related to something in source filenames and/or EXIF data, I'd imagine it'll be extremely difficult.
If they are, it becomes a lot less of an effort, but still a bit of an effort.
The source file names aren't changing, only the folder structure.
@argv_minus_one
I didn't say they were.