I use Proxmox Backup Server for my backups. Everything backups to 1 system at home. I then sync the data store to a little NAS I have at a family members house across town and also to a cheap storage VPS on the other side of the country. I also do a manual sync of the data store to a single external drive that I manually connect and disconnect.

None of my data hoarding files are backed up as that would cost way too much. That could change if I ever find a killer deal on an LTO8 or better drive and tapes.

I know that Hetzner has some decently priced Storage Boxes that you can mount using rclone and then backup to. Keep in mind that latency will be a factor so it could be slow.