I’d start with some googling about backup and sync. There are recent threads here on the subject, too, e.g.
No automated setup can decide for you what files you want to sync, and how. That’s up to the user to decide.
This is the reason I usually recommend people DON’T use the WD automated setup, because it tries to setup facilities that the users don’t need, and don’t understand, and makes no attempt to help the user understand what they’re doing, or how their device works.
