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Restores

You can restore full virtual machines in place or to a new destination. Restores are supported for both Windows and Linux clients.

Considerations

  • For Azure Resource Manager deployments: You can backup virtual machines configured with Azure unmanaged and managed disks. From these backups, you can restore full virtual machines and restore guest files and folders.
  • You can backup and restore Azure managed disks that are up to 8 TB.
  • For virtual machines deployed in Azure Classic, data recovery to Premium storage accounts is not supported. This restriction applies for Live Sync, VM conversion, and VM restore jobs.
  • Virtual machines (VMs) with encrypted blobs can be protected and fully recovered. However, guest file recovery of these VMs is not currently supported.
  • If a virtual machine is encrypted using Azure Key Vault:
    • Full VM restores are supported per source subscription. However, restores of encrypted VMs to a different subscription are not supported due to a Microsoft Azure limitation with restoring Key Vault across subscriptions.
    • Restoring to a different region under the same subscription will create a new key vault automatically, and the restore job will complete successfully. For more information, see AZR0002: Out of place VM restore to different region might fail when source VM is encrypted.
    • Keys and secrets are not accessible to subscription users by default when the Key Vault itself is restored. The restore operation will add only the application's service principal in the Key Vault access control as an authorized user. If necessary, the subscription administrator can make changes to these permissions using the Azure portal.
    • Microsoft restrictions for virtual machines encrypted using Azure Key Vault also apply to encrypted Azure virtual machines in your Commcell environment for restoring your virtual machine and Key Vault. For more information, see Azure Key Vault.

Restore Process

A full VM restore operation includes the following stages:

  1. Engage the Virtual Server file system driver.
  2. For an in-place restore, delete the existing VM.
  3. Mount VM disks.
  4. Write data from library.
    • For an in-place restore, recreate the VM using VM disk data and the JSON configuration file for the VM.
    • For VMs that include Azure managed disks, the restore operation creates an unmanaged VM using a staging account, and then converts the unmanaged VM to an Azure managed VM.
    • For an out-of-place restore, create a new VM using the destination information specified for the restore (such as the ARM model name, resource group, subscription, VM size, and storage account).
  5. If a network security group was specified for the source VM, configure the same security group for the restored VM.

    If no security group was specified for the source VM, you can add a security group to the destination VM after the restore operation completes.

Last modified: 1/13/2020 10:30:37 PM