We officially recommend a Facility backup is taken manually every night.
In theory, a SQL backup to a bk file is enough to save your bacon in an emergency.
If you need further advice please contact support who will be able to help with this. If you need help specifically with how to set up the backup within SQL, i believe there is a document already produced. If not, perhaps i should produce one?
Michael Sanderson
Technical Support Engineer
Serco Learning Solutions