I don’t run anything on the server because I don’t need to. I have my home server mounted as a network drive in Windows, so I just point Kopia’s database at a folder in there. It’s stored as an encrypted backup, and I’ve got the config for Kopia backed up in a few places (and the encryption key as well) so if the worst case scenario happens to my PC I’ll just reinstall Kopia on a fresh windows install + HDD, restore the config from the backup, then restore the backup.
I also have a backup target to an older 8TB drive that I leave with a friend and update whenever he visits for extra safety, if my whole apartment with my PC and server burns down I’ll at least be able to have an outdated snapshot and lose only a month or so instead of decades.