The best thing you can do to increase your confidence in the data reliability is to invest in backups AND doing at least RAID-1 on a reliable check-summing filesystem like ZFS, which Proxmox supports easily out of the box.
I have ZFS and cloud based backups and I’ve never lost or corrupted data in over 10 years.
And personally, I don’t back up my movies/TV shows. The volume is too high to bother and with ZFS snapshots and reliability, and the high seas being what they are, most everything is (eventually) recoverable.
Maintenance is easier than you think. I “maintain” 40+ services by simply automatically updating them. And if that makes one stop working (very rare) I get an alert and fix it when I get time.
I use ansible for that, though you could more easily accomplish much the same with Watchtower.