If u select any kind of backup policy, Protection Manager will be default use QSM - so i think this is what you are looking for. Here are more details:
By default, Protection Manager analyzes the protection policy, available resources, and licenses on the storage systems to determine whether it can create Qtree SnapMirror relationships. If Qtree SnapMirror is not feasible, it uses SnapVault relationships instead. This behavior can be changed using this CLI command:
dfm option set pmQSMBackupPreferred=No
In this case, Protection Manager will try first to use SnapVault relationships, and only if it can't will it use Qtree SnapMirror relationships (if licensed).
If the schedule specifies that the data is to be backed up more frequently than once per hour, then Protection Manager must create a Qtree SnapMirror relationship regardless of this option.
If the source qtree contains a space in its name, Protection Manager will try to create only SnapVault relationships regardless of the option.
If the source data is an Open Systems directory, the relationship must be Open Systems SnapVault.