The Bunker node requires additional storage only for the Bunker Replicator Log as it does not contain any data volumes in the RVG. By default, the replication to the Bunker node is performed using synchronous override mode to provide zero RPO.

Bunker replication combines the advantages of synchronous and asynchronous replication, to achieve zero RPO and limited or required RTO, without the overhead of maintaining two complete copies of your data on additional Secondary sites. The Bunker feature also allows the flexibility to choose between RPO or RTO depending on your specific requirements. Ideally, the Bunker Replicator Log should be at a site far away to not be within the same disaster zone as the Primary site, yet close enough to not impede the synchronous update of the Bunker Replicator Log.