@moderators please merge the two threads. Also looks now more like general support request, so moved again.
The backup also contains your library settings (the old connection to your NAS with the old username/password), so it is expected that you have to correct it after loading an old backup. Did you check, after you made the needed corrections, if your edits are gone? AFAIK they should persist as it’s what also might happen when one chooses to migrate the core.