Great post from he DPM Team where they explain how to use the manual creation fo the replica.
During creation of a protection group using the Create New Protection Group Wizard, DPM asks you to select a replica creation method to copy the data to be protected to the DPM computer. You can selectAutomatically, for which DPM copies the data across the network, or Manually. When you select manual replica creation, you must manually copy the data you want protected to the DPM computer using removable media.
Read more at source: http://blogs.technet.com/b/dpm/archive/2014/02/10/how-to-create-a-manual-replica-for-bmr-and-system-state-from-a-primary-dpm-server-to-a-secondary.aspx