To cluster DLO in a Backup Exec cluster configuration, you must install DLO on each cluster node.
You cannot add DLO to an existing Backup Exec cluster. Either add DLO when you configure a cluster, or uncluster an existing cluster, add DLO, and then reconfigure the cluster.
If the Desktop Agent was installed from a cluster node that is now inactive, it does not reconnect to the cluster following the unclustering process.
About installing the Backup Exec Desktop and Laptop Option
Using Backup Exec with Veritas Cluster Server
Uninstalling Backup Exec from a Microsoft cluster