A replication service group can be defined as a group that is comprised of certain types of resources. The replication service group can have one or more of the types of resources that are explained below, however, it cannot include any additional components. This service group cannot be a part of the application service group, as the replication service group represents the replicated volumes and other resources that must be available and online on the Primary or Secondary nodes at the same time, unlike the application service group.