[faniediv]

Thanks, if the current process does not work, I will try your advice. I just realised that I have used synctoy for years to synchronise between main library and backups. This can be where all the duplicates come from?
The folders mostly are identical regarding case. Some folders do differ:fire & custard; fire and custard, but they are in the minority.
I have no idea how to insert a screen copy. Hope this works