My experience is that overall the solutions were really clever and gratifying in these games. I did have the occasional hang up with having to look something up, but they were mostly my own fault from only playing it 3 hours at a time weekly (or longer if I got caught up with other stuff), forgetting some details in between
Personal files: Syncthing between all devices and a TrueNAS Scale NAS. TrueNAS does snapshots 4 times a day, with a retention policy of 30 days. From there, a nightly sync to Backblaze B2 happens, also with a 30 day retention policy. Occasional manual backups to external drives too.
Homelab/Servers: Proxmox VM and LXC container exports nightly to TrueNAS, with a retention policy of 7 days. A separate weekly export happens to a separate TrueNAS share, that gets synced to B2 weekly, with a retention policy of 30 says. Also has occasional external drive backups.