In Azure, is it possible to retrieve a Backup Policy from a VM tag value?

Question

TL;DR

Is it possible to get the name of a backup policy I'll want to apply, from a Virtual Machine tag value ? For example : backup=myBackupPolicyDaily1AM or backup=myBackupPolicyWeekly

Context

In Azure, I have these resources :

• A Recovery Services vault
• Within this Recovery Services vault, a Backup Policy named DefaultPolicy
• An Azure policy duplicated from the builtin Configure backup on VMs with a given tag to an existing recovery services vault in the same location (https://learn.microsoft.com/en-us/azure/backup/backup-azure-auto-enable-backup#policy-2---configure-backup-on-vms-with-a-given-tag-to-an-existing-recovery-services-vault-in-the-same-location)
• A virtual machine vmtest01 having a tag backup=backupme

What's working now

I've applied the Azure Policy with these parameters :

• inclusionTagName: backup
• inclusionTagValue: backupme
• vaultLocation: West Europe (from dropdown list)
• backupPolicyId: DefaultPolicy (From dropdown list, after selecting my recovery vault)

Things are working fine so far. After a Remediation, vmtest01 is backed up.

What I want now

Now I want to apply the Backup Policy name I'll have from the backup tag value. For example :

• VMs having the tag backup=myBackupPolicyDaily1AM will have the myBackupPolicyDaily1AM Backup Policy
• VMs having the tag backup=myBackupPolicyWeekly will have the myBackupPolicyWeekly Backup Policy

I've search on the interwebs and didn't see any example for that use case. Is it possible ?

Note: All the resources are in the same location.

Answer 1

Have you tried changing the BackupPolicy variable to [parameters('inclusionTagValue')] (~ line 473)? You will first need to duplicate the built-in policy and make it custom. I am testing this now but it will take a little time for Azure policy to evaluate and remediate.

        "variables": {
          "backupFabric": "Azure",
          "backupPolicy": "[parameters('inclusionTagValue')]",
          "v2VmType": "Microsoft.Compute/virtualMachines",
          "v2VmContainer": "iaasvmcontainer;iaasvmcontainerv2;",
          "v2Vm": "vm;iaasvmcontainerv2;",
          "vaultName": "[take(concat('RSVault-', parameters('location'), '-', guid(resourceGroup().id)),50)]"
            }