Good to hear! (and I see you’ve posted the update to the PVE thread too 
)
You technically can—it’s just not fully POSIX compliant. We write to it directly[1] for some things in our Ansible role (where I’ve written at length on how it’s particular about how you write to it). Agreed though that what does need backing up is the config.db file.
I’m actually impressed at the Ceph OSD recovery, I guess having a backup of /etc/ceph made it that much simpler?
e.g. in realms_config.yml ↩︎