by Mark Pearson.
Christos,
You have to create the backup with student user accounts and their grades enabled. The grades won't get into the backup file unless there are user accounts to associate them with. This means that the restore process should create the student accounts (if neccessary) and enroll them in the course together with their grades using the data from the course backup. Enrolling students into the course after doing the restore (which is what I think you described doing) won't bring back any grades. Does this make sense?