I have Proxmox Backup Server backing up to an external drive nightly, and then about every 2 or 3 weeks also backup to a cold storage which I store offsite. (this is bad practice I know but I have enough redundancies in place of personal data that I’m ok with it).

For critical info like my personal data I have a sync-thing that is syncing to 3 devices, so for personal info I have roughly 4 copies(across different devices) + the PBS + potentially dated offsite.