Backing up clustered servers in PureDisk 6.6.1

Guys,

i have purdisk 6.6.1 PureDisk enviornment which is backing up 20 remote sites across Asia. I have a requirement to backup the clustered servers now.. i know how it works in Netbackup; you installed agent on both active and passive node and tell Netbackup the cluster name to back the cluster up. but how can we backup cluster in puredisk.. i have installed Puredisk agent on both active and passive node but during the install it runs the registration process and the client get registered with the node..

we can setup the backup on both nodes as they both using the shared storage and activate the bacukp only the ACTIVE node but that doesnt seem logical; if the cluster failover my backup would fail..

any suggesstion would be appreicated..