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I just saved two files (CD1 and CD 2 of an oratorio, both 7z files) to the same directory and didn't realize that they had the same name. CD1 was overwritten by CD2. Shouldn't UE have renamed the second one to xxx(2)? Is there anything I can do to get CD1 back?

I replied also in email, there is rename option in edit menu->properties->save/unpack, save, duplicate files.

For purposes of par2 repair and incomplete saves overwrite is preferable, but if set to rename it will mostly work.