Document microceph, microovn, microcloud backup/restore procedures

Please document the steps needed to backup/restore microceph, microovn, and/or microcloud

maybe its a reference to external ceph, ovn, lxd docs… but these are complex pieces of software and when things go wrong its good to have a central place to look.

For dedicated devs it might be trivial to fix some issues

Also in some cases it might be useful to start documenting manual sql queries needed to fix things like missing/broken networks etc.

@ru-fu some ideas for future docs