I’m just running into this now. It also won’t let me log into the web interface. I’m glad I experimented with a second install before upgrading my primary pihole.

I tried Kopia but it was unstable and janky, so now it’s whenever I remember to manually run a bunch of rsync. I backup my desktop to cold storage on the first of the month, so I should get in the habit of backing up my server to the NAS then also.

Raspberry Pi 2 or 3 (can’t remember which) controlled through the TV with the remote. It’s running LibreElec (Kodi) with the Jellyfin plugin. Discoverability isn’t great through Kodi, but I can always use a computer or phone to find the media and cast if I need to.