Attaching Disks to an Existing Azure Virtual Machine

When performing a restore from a backup of an Azure VM, you can choose to restore a VM disk and attach it to a different VM that already exists.

By attaching a disk to an existing VM, you can access or reuse the data on the disk without restoring the full source VM.

Before You Begin

  • You can use this option from streaming backups or IntelliSnap backup copies, but not when restoring directly from IntelliSnap backups.
  • For Azure Classic: When performing a restore from a backup of an Azure VM, you cannot restore a VM disk and attach it to multiple VMs that are part of the same Cloud Service group.
  • Attaching Disks is supported for both Managed Disks and Unmanaged Disks.
  • When encrypted disks are restored using Attach Disk restore, users must download the secret keys using the virtual machine file restores, and then decrypt the disks using the restored secrets to access the data successfully.


  1. From the CommCell Browser, expand Client Computers > virtualization_client > Virtual Server > instance > backup_set.
  2. Initiate the restore from a subclient or backup set:
    • From a subclient: Right-click the subclient and select Browse and Restore.
    • From a backup set: Right-click the backup set, point to All Tasks, and click Browse and Restore.
  3. In the Browse and Restore Options dialog box, select Attach Disk to Existing VM and click View Content.
  4. From the list of backed up virtual machines in the Client tab, expand a virtual machine, select a disk to be restored, and click Recover All Selected.

    The Restore Options for All Selected Items dialog box appears.

  5. Provide the following information:
    • Azure Subscription: To restore to a different Azure subscription, select the client for the Azure subscription from this list.
    • Proxy Client: To use a different proxy for the restore, select the proxy from this list.
    • VM and Disk: This column shows information for the source VM. You can expand a VM to display disks.
    • Restore to Existing VM: In this column, click in the row for the VM, and then click ... to browse and select the VM to which the disk should be attached.
    • Change Disk name to: In this column, click in the row for the disk, and the enter the new name for the disk.

      If you do not enter disk names, unique disk names are created automatically including a time stamp.

    • Storage Account: Select the storage account for the restored disk.
  6. Click OK to submit the restore job.

Last modified: 9/12/2019 7:11:57 PM