Automatically enable/ disable Policy using script

Hi all,

I'm looking for a solution to automatically enable/ disable a Policy using script.

Background:  

We have a invoicing system on a Windows VM with a web interface for access on PC's in our local network.

The invoicing system creates an automatic backup and sent the backup to our company cloud. 

One policy allows the invoicing VB to access the internet.

However, for security reason it is not necessary for the VM to have 24/7 internet access and the invoicing system works great without the policy enabled. The backup of the invoicing system takes about 10 min. 

We would like to use a script or other steps to turn off the policy and back on for the time the system does the backup and upload the backup to our cloud.

Is that possible or is there a other way?

Many thanks in advance