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

Published date: 13 August, 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 enrol on the preview without any impact to your ongoing backups. Once the subscription has been enrolled on the preview, all the virtual machines with disk sizes up to 30 TB should be successfully backed up. To enrol on the preview:

Please execute the following cmdlets from an elevated PowerShell terminal:


  1. Log in 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 programme:

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

Please wait for 30 minutes for the subscription to be enrolled on the preview.


  1. To check the status, run the following cmdlets

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


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

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



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

  • Azure Backup
  • Features
  • Services

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