Merge pull request #277135 from rajats22/aksbackupupdate-0406-01

AKS Backup Update

Author: prmerger-automator[bot]

articles/backup/azure-kubernetes-service-cluster-backup-support-matrix.md

@@ -43,7 +43,9 @@ You can use [Azure Backup](./backup-overview.md) to help protect Azure Kubernete
 
 - Currently, AKS clusters using a Service Principal aren't supported. If your AKS cluster uses a Service Principal, you can [update your AKS cluster to use a System Identity](../aks/use-managed-identity.md#enable-managed-identities-on-an-existing-aks-cluster).
 
-- You can deploy the Backup Extension in the Ubuntu-based cluster nodes. AKS Clusters with the Windows-based nodes aren't supported by Azure Backup for AKS.
+- You can only install the Backup Extension on agent nodes with Ubuntu and Azure Linux as Operating System. AKS Clusters with Windows based agent nodes do not allow Backup Extension installation.
+
+- You cannot install Backup Extension in AKS Cluster with ARM64 based agent nodes irrespective of Operating System (Ubuntu/Azure Linux/Windows) running on these nodes.
 
 - You must install the backup extension in the AKS cluster. If you're using Azure CLI to install the backup extension, ensure that the version is 2.41 or later. Use `az upgrade` command to upgrade the Azure CLI.