This is the Relative Name (RN) of the configuration-backup policy control object for the UCS domain, the single naming component that distinguishes this ConfigBackup instance from its sibling instances under the same parent object. UCS Manager appends this RN to the parent's DN to build the full path, so it is the piece an admin checks when several ConfigBackup instances exist side by side and need to be told apart, because its source field shows whether backup scheduling is being driven locally or by an external policy source. For a domain whose nightly config backup schedule is managed centrally rather than per-domain, if two ConfigBackup instances share the same parent, this RN is the one field that tells an admin which of the two a given SNMP row is actually describing.