What files can be deleted in ~/.bitcoin?

Question

Database

Which files in the ~/.bitcoin folder can be safely deleted to free up space? I suppose you can also delete indexes if prune is not enabled and you need to archive the folder
First of all, debug.log, of course. I want to transfer the database to another server with a 7z archive, but I don’t want to store too much. With prune=600 it turned out to be about 2 GB 7z, a bit too much