Space reclamation operations on cloud storage pools are run on-demand and cannot be scheduled in the System Created DDB Space Reclamation schedule policy/. You can either run the space reclamation operation manually using the default system schedule or create a separate schedule for the cloud storage pool.
For more information on the supported cloud storage vendors for space reclamation, see Supported Cloud Storage for Space Reclamation.
You can deploy an extra small MediaAgent on cloud environment for performing space reclamation operation on deduplicated data hosted on cloud library. For details about MediaAgent sizing, see the following: