It all depends on how much you treasure that 2TB of data. If you cannot afford to lose it, then you don't really have any other option. All I'm saying is that self-hosting and backups go hand in hand. Self-hosting without backups is just asking for trouble. But what you are talking about sounds more like 2TB of old photos, that's not really self-hosting. Just get a second 2TB drive and copy it there. This thread started with talks about password managers and their backups - those aren't 2TB.