Update whats-new-overview.md

Author: MSFT-Andrea

concepts/whats-new-overview.md

@@ -20,10 +20,22 @@ For details about previous updates to Microsoft Graph, see [Microsoft Graph what
 
 ## April 2026: New and generally available
 
+### Backup storage
+
+- When a [protection policy is deactivated](/graph/api/protectionpolicybase-deactivate), backup activity stops immediately, no new backups are taken, and the protected resources are no longer covered by the policy. Any backups taken before deactivation are retained according to the retention policy, after which they're offboarded. You can restore data using previous restore points even after deactivation.
+- A [protection policy can be deleted](/graph/api/protectionpolicybase-delete) only after it was [deactivated](/graph/api/protectionpolicybase-deactivate). When you delete a policy, all associated protection units are removed, and backup protection stops for the resources previously covered by the policy. Existing backup data is retained according to the retention policy before it's offboarded. You can restore data using previous restore points even after deletion.
+
 ### Teamwork and communications | Messaging
 
 Removed the `model` parameters and payment-model guidance from Microsoft Teams export APIs and related change-notification documentation. The `model` query parameter is no longer required and is ignored if supplied. For more information, see [Payment models and licensing requirements for Microsoft Teams APIs](/graph/teams-licenses).
 
+## April 2026: New in preview only
+
+### Backup storage
+
+- When a [protection policy is deactivated](/graph/api/protectionpolicybase-deactivate?view=graph-rest-beta&preserve-view=true), backup activity stops immediately, no new backups are taken, and the protected resources are no longer covered by the policy. Any backups taken before deactivation are retained according to the retention policy, after which they're offboarded. You can restore data using previous restore points even after deactivation.
+- A [protection policy can be deleted](/graph/api/protectionpolicybase-delete?view=graph-rest-beta&preserve-view=true) only after it was [deactivated](/graph/api/protectionpolicybase-deactivate?view=graph-rest-beta&preserve-view=true). When you delete a policy, all associated protection units are removed, and backup protection stops for the resources previously covered by the policy. Existing backup data is retained according to the retention policy before it's offboarded. You can restore data using previous restore points even after deletion.
+
 ## March 2026: New and generally available
 
 ### Applications