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Correct.
Clustered clients are normally already clustered as File server or Database/Application server (Oracle, SQL, Exchange, etc....). The resource/service group configuration includes the virtual IP and hostname as part of the cluster.
These clusters can also be configured to have an active instance on more than one cluster node, e.g where SQL Instance1 runs on one node and virtual name/IP linked to Instance1 (e.g SQL-INST1) and Instance2 runs on another node and virtual name/IP linked to Instance2 (e.g SQL-INST2). Both instances can run on any node, even on the same node in case of node failure.
In this example, NBU Client software is installed on each node.
One policy will be added to backup Instance1 on Client Name SQL-INST1 and another policy to backup Instance2 on Client Name SQL-INST2.
You need to ensure proper forward and reverse name lookup between master/media server and virtual name(s). Use DNS or local hosts files.
Another policy can be added to backup local drives (e.g. C:\) on the physical nodes. Here the actual node names will be used in Client List.
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