How to prevent a full database backup We are in the middle of migration, a full backup has been taken and copied to the destination. On Friday, we plan to do a differential backup, but someone has by mistake taken another full backup (did not use copy_only). 

We want to prevent this in the future. We can think of DENYing (as follows), but we don't know the specific login. So, how do we make sure no-one can do a full backup?

DENY BACKUP DATABASE TO [LoginName]
The most "normal" way to prevent database backup - simply ask persons who have permissions to backup databases, do NOT do any full backups (that are not copy_only) until migration is complete...