[SOLVED] How do I prevent PBS to backup a mounted disk in a running VM (snapshot)?

[gctwnl]

I've run into the following. I have PVE running and I wanted to backup a VM (32GB) to PBS. The VM is a running Ubuntu which has a 500GB volume mounted. What happens is that PVE backup tries to backup the entire 532GB. That was unexpected as I thought it would not try to backup anything but /

How do I make sure that PVE only backs up the 32GB VM and not the 500GB mounted volume?

 

[gctwnl]

Answering myself: in the Hardware section of the VM, open the Hard Disk not to backup, uncheck the checkbox of 'backup'. Duh.