Setup Backups for data not managed by Ansible

Something like restic or kopia can backup to an object storage. Maybe cloud hosted so we don't have to worry about it.

## m3.noisebridge.net
* [ ] mysql backups of mediawiki
* [ ] mailman configs/archives

## m4.noisebridge.net
* [ ] library.noisebridge.net
* [ ] parts.noisebridge.net

## m5.noisebridge.net
* [ ] donate.noisebridge.net
