

Might be a better question for someone who knows more JF ffmpeg configs, but I think the HEVC up top should be checked and the bottom range extended hevc should be unchecked. I think you should have AV1 support too.
Worst case, start with h264 and move down the list

Also may be good for c/jellyfin, but what I’d see if you could do is leverage a backup tool. Export and download, then import, all from the web. I know there is a built in backup function, and I recall a few plugins as well that handled backups.
Seems to me that might be the most straightforward method - but again, probably better with a more jellyfin focused comm for that. I have moved that LXC around between a bunch of machines at this point, so snapshots and backups via proxmox backup server are all I need.