A non-hierarchical duplication destination means that the destination does not have a specific backup source. It uses either the primary copy or the best copy.
To add a non-hierarchical duplication destination
Make sure that no destination is selected in the Change Storage Lifecycle policy dialog.
Select the Duplication type in the New Storage Destination dialog box. Complete the remaining fields.
Click OK to add the duplication destination. The duplication destination is added at the end of the destination list without any indentation.