Changing values in an existing deployment. DB, File System etc.

Hi All.

I am looking at a number of ways to take a copy of my Production. This is mainly for DR and any other scenario where we might need to create a copy of our existing environment.

I am using Azure NetApp Files. So in my deployment I am choosing nfs-byo. I can take a snapshot of my existing NetApp volume and restore it to a new Volume.

To change the mount point for the controller is relatively easy. I understand I can just amend /etc/fstab. However, I am having some difficulty trying to work out how to do this for the VMSS.

I understand on creation of a new instance the VMSS creates /var/lib/cloud/instance/moodle_on_azure_configs.json with all the relevant values. However after the first deploy, where are all the values stored? How would we edit them if we needed to?