You can store the replica volume and recovery point volume either in the DPM storage pool or on custom volumes, which are ...

You can store the replica volume and recovery point volume either in the DPM storage pool or on custom volumes, which are volumes that you created, such as SAN volumes.
If you use the DPM storage pool, you can specify the size of the replica volume and recovery point volume below. If you use custom volumes, you can choose not to format the volumes. For more information, click Help.

Replica and recovery point volumes: