If you pass a whole raw disk, not virtualized, then TrueNAS should not complain. I don’t know if you can do that in proxmox, I haven’t tried.

Personally I’d get rid of TrueNAS. Even if docker is down, the VM with the data is still up and accessible over anything running on the VM, like scp via ssh.

Memtest? Boot a live image and stress test each component?

I don’t think it’s overheating, usually that presents as throttling followed by a thermal protection power off.

Well it’s not open source that I see, so you’ll be doing significant development to match it. There are probably place clones that you can use as a start, then tie in OSM. But that’s far easier said than done.

If you’re adding drives with more capacity, why bother converting? Just create the new one, copy the data, then expand over the old disks.

Have backups for anything you can’t afford to lose, and be patient.

I don’t think you want two VPN services, I think you want one VPN service and plain network routing. Use the VPN server as the local gateway, and the VPN server routes that traffic up the tunnel.

I think you should seek someone with experience, a mentor. Otherwise it’s the blind leading the blind.

Step one is check with the university IT department. Don’t put random unmanageable shit on other people’s networks.

Why a Mac running Linux? I can’t think of a use case for that.

I still don’t recommend putting jellyfin on the Internet. It’s not designed for it. There are some API endpoints you can access without authentication, not to mention potential authentication bypass vulnerabilities.

5 minutes is also probably too frequent. Leases are usually significantly longer. You might hit a rate limit and get blocked.