Merge pull request #197397 from rwike77/patch-5

Info on ADAL deprecation and migration

Author: PRMerger4

articles/api-management/api-management-howto-disaster-recovery-backup-restore.md

@@ -77,6 +77,9 @@ All of the tasks that you do on resources using the Azure Resource Manager must
 
 Before calling the APIs that generate the backup and restore, you need to get a token. The following example uses the [Microsoft.IdentityModel.Clients.ActiveDirectory](https://www.nuget.org/packages/Microsoft.IdentityModel.Clients.ActiveDirectory) NuGet package to retrieve the token.
 
+> [!IMPORTANT]
+> The [Microsoft.IdentityModel.Clients.ActiveDirectory](https://www.nuget.org/packages/Microsoft.IdentityModel.Clients.ActiveDirectory) NuGet package and Azure AD Authentication Library (ADAL) have been deprecated. No new features have been added since June 30, 2020.   We strongly encourage you to upgrade, see the [migration guide](/azure/active-directory/develop/msal-migration) for more details. 
+
 ```csharp
 using Microsoft.IdentityModel.Clients.ActiveDirectory;
 using System;