I might be crazy but I have a 20TB WD Red Pro in a padded, water proof, locking, case that I take a full backup on and then drive it over to a family members 30m away once a month or so.
It's a full encrypted backup of all my important stuff in a relatively different geographic location.
All of my VM data backs up hourly to my NAS as well. Which then gets backed up onto the large drive monthly.
Monthly granularity isn't that good to be fair but it's better than nothing. I should probably back up the more important rapidly changing stuff online daily.