On 1TB external USB drive. I gave up on all online services when I moved to new computer. Sure it is not convenient, but I dont have to worry about my relationship to any online service anymore. It is all local, all near.
Now, I'm on the cheap side, but I find AWS expensive compared to other backup services like backblaze. Perhaps it's the backup services that are overly cheap, I don't know, but I'd love to have a cheaper service available for backing up from a NAS (backblaze seems to be pain to setup on a NAS). I'd be OK with major inconvenience on retreaval, as long as it's cheap to backup.
Glacier is $10/month for 1TB. For highly durable long-term storage, that is stupid cheap.