Minimum Privs needed for Virtualmin Backups

I am having trouble getting all databases used by different hosted sudomains, to get "seen" and backed up by the BM backup program. Some databases I did create manually afterwards with different usernames for the programs.Even if I click on some subdomains and then "Edit Databases" I dont see the full list of databases so that I could try to "Import" one. For the vm backup took to work, exactly what privileges are needed? Should all databases simply have all privs for the account holder (johnny in this case) and with no pw? Or do they all have to have database privs which exactly match the hosting account username and password?