updated backups sc requirements

Author: dnethi

articles/azure-arc/data/create-sql-managed-instance-using-kubernetes-native-tools.md

@@ -30,6 +30,11 @@ To create a SQL managed instance, you need to create a Kubernetes secret to stor
 
 You can use the [template yaml](https://raw.githubusercontent.com/microsoft/azure_arc/main/arc_data_services/deploy/yaml/sqlmi.yaml) file as a starting point to create your own custom SQL managed instance yaml file.  Download this file to your local computer and open it in a text editor.  It is useful to use a text editor such as [VS Code](https://code.visualstudio.com/download) that support syntax highlighting and linting for yaml files.
 
+> [!NOTE]
+>Note: Starting with the February release, a ReadWriteMany (RWX) capable storage class needs to be specified for backups. Learn more about [access modes](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#access-modes)
+If no storage class is specified for backups, the default storage class in kubernetes is used and if this is not RWX capable, the Arc SQL Managed Instance installation may not succeed. 
+
+
 This is an example yaml file:
 
 ```yaml