NetBackup for VMware support for fault tolerant VMs
NetBackup supports backing up and restoring primary fault tolerant virtual machines on vSphere 6.0 and later. (NetBackup does not backup or restore the secondary VMs.) If you choose to overwrite the VM during the restore, NetBackup deletes both the primary and the secondary VMs during the restore process. NetBackup then restores the primary VM.
Fault tolerance is not enabled on the restored VM. After the restore has completed, you can turn on fault tolerance.
For information about how to turn on fault tolerance, see the VMware documentation for your version of vSphere.