Replications are the primary resource that governs the policy of cross-region replication between source and target file systems. Replications are associated with a secondary resource called a ``ReplicationTarget` <>`__ located in another availability domain in the same or different region. The replication retrieves the delta of data between two snapshots of a source file system and sends it to the associated ReplicationTarget, which applies it to the target file system. For more information, see File System Replication.