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Announcing Azure Backup limited public preview support for large disks up to 30TB size

Published date: August 13, 2019

Today, we are announcing the limited public preview of larger and more powerful Azure Managed Disks of up to 30 TB size. This preview provides production level support for managed virtual machines. You can seamlessly enroll to the preview without any impact to your on-going backups. Once the subscription is enrolled into the preview, all the virtual machines with disk sizes up to 30TB should be successfully backed up. To enroll in the preview:

Please execute the following cmdlets from an elevated PowerShell terminal:


  1. Login to Azure Account.

PS C:> Login-AzureRmAccount


  1. Select the subscription which you want to register for the upgrade:

PS C:>  Get-AzureRmSubscription –SubscriptionName "Subscription Name" | Select-AzureRmSubscription


  1. Register this subscription to the preview program:

PS C:> Register-AzureRmProviderFeature -FeatureName "LargeDiskVMBackupPreview" –ProviderNamespace Microsoft.RecoveryServices

Please wait for 30 minutes for the subscription to get enrolled into the preview.


  1. To check the status, run the following cmdlets

PS C:> Get-AzureRmProviderFeature -FeatureName "LargeDiskVMBackup Preview" -ProviderNamespace Microsoft.RecoveryServices


  1. Once the subscription shows as registered, run the following command:

PS C:> Register-AzureRmResourceProvider -ProviderNamespace Microsoft.RecoveryServices



P.S. Encrypted VMs with disks greater than 4TB size are not supported as a part of this preview.

  • Azure Backup
  • Features
  • Services

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