About excluding virtual disks from the backup
NetBackup provides several methods to exclude virtual machine disks from backups. One method lets you exclude the virtual disks that are defined in a virtual machine's Custom Attribute. NetBackup then excludes those disks if you specify the Custom Attribute name in the backup policy.
Veritas provides a Virtual Disk Exclusion Wizard in the NetBackup plug-in for VMware vSphere Web Client. You can use the wizard to configure and apply a Custom Attribute to a virtual machine or multiple virtual machines.
To use the plug-in to configure a Custom Attribute to exclude disks from backups, the vCenter Global credentials Manage custom attributes and Set custom attribute are required.