If for some reason you have issues with image level backup and need to stop the quescing of VMs this is how you do it from Avamar.
Go to the dataset for the VM image backup and edit it, then go to the 'options' tab.
Select 'Windows VMware Image' from the drop
down menu.
At the bottom click on the 'More' button.
In attribute enter: [avvcbimage]quiesce_fs
In Attribute Value enter: false
Click the + button to add
End should look like this:
Repeat this for ‘Linux VMware Image’ plug-in if needed.