Nightly backups is going to be our approach for now. We may add a replicated server at a later date, but not now.
You're right, I didn't word my question well. I'm looking for a clear list of which files need to be backed up/restored. The closest I've seen in the docs is: https://www.cyrusimap.org/imap/download/upgrade.html#backup-and-copy-existing-data
Also, is restoring as simple as (1) stop cyrus, (2) restore files, (3) start cyrus? Are there any additional steps required when starting cyrus after restoring the filesystem?
Thanks again.