You can back up a VM or a VM group on demand. During the backup VMs are distributed to access nodes in a round-robin fashion.
From the navigation pane, go to Protect > Virtualization.
The Virtual machines page appears.
Back up the VM or the VM group:
To back up a VM, in the row for the VM, click the action button, and then select Back up.
To back up all the VMs in a VM group, do the following:
Click the VM groups tab.
In the row for the VM group, click the action button , and then select Back up.