Can someone give me some information about how data replication really works between databases on exchange 2010 DAG. My understanding is that there is an initial database copy when first setup replica and then you have transaction logs played between and replicated between the databases. How much bandwidth utilization are we talking about ? let's say your data has already been replicated, how much traffic should you expect across WAN link if you have 500 users in different sides of this WAN link. what if you have different sites across the country. Can you guys give me some information about inner of data replication in exchange 2010.