We have a test lab "air gapped" and would like to do something similar. Replicate the deduplicated backup data disk volumes on a given day, run a DR backup, then revive a clone commserver inside the lab to restore whatever is needed (for DR tests etc), that clone needs to remain unaware of the real world so that it doesn't confuse real-world media agents etc.
Michal, are you wanting to do something like Commserve Failover / LiveSync? We just configured that. We now have a clone of our primary commserver that's always within 15 minutes current. You need to find the latest (SP18) instructions to set it up correctly.