IBM TS7650G User Manual page 28

Before defining replication policies, however, you must first create connections
between the repositories. To create connections, you define replication groups.
Depending on your environment, you create replication groups in either
"many-to-one" or "many-to-many" topologies.
In a "many-to-one" topology, you create replication groups in which source
repositories can receive local backups and replicate to a single destination. The
destination repository can then act as a Disaster Recovery site for any number of
the source repositories, and still allow local backups, as well as replication, from
the active source repositories.
In a "many-to-many" topology, you create replication groups where multiple
repositories can replicate to each other. You can define a many-to-many replication
group where each repository assumes the responsibility of a destination repository
and can receive local backups, replicate data to remote repositories, and receive
replicated data from remote repositories.
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IBM TS7650G Deduplication Gateway for ProtecTIER : User's Guide for FSI Systems