Backing Up Azure VMs

You can perform backups automatically based on the configuration for a hypervisor or VM group, or manually for a VM group or a specific VM.

The first backup of a VM is always a full backup. By default, all subsequent backups are incremental, capturing any changes to VM data since the last backup.

You can recover virtual machine data, even when the most recent backup was incremental.

Backups run based on the following options:

• Initial full backup: When you use Guided setup to set up the Virtualization solution, use the Back up now option to perform a backup for the default VM group.

• Scheduled incremental backups: The server backup plan that is assigned to a VM group includes a schedule for ongoing incremental backups. Those backups are performed automatically based on the schedule, without requiring any user action.

• Manual backups: You can perform on-demand backups for a VM group or for a specific VM.

If backups cannot start immediately, the backup jobs are queued.

What Gets Backed Up

• Azure Generation 1 and Azure Generation 2 VMs.

• Disks that are configured by users through the Azure portal, including disks that are configured on Standard and Premium storage accounts.

• For Azure Resource Manager deployments, VMs that are configured with Azure unmanaged and managed disks. From these backups, you can restore full VMs and restore guest files and folders.

• Azure managed disks that are 8 TB or smaller.

• Unmanaged and managed disks with Changed Block Tracking enabled.

  For more information, see Changed Block Tracking for Azure (CBT).

• VMs that have encrypted blobs.

  These VMs can be protected and fully recovered. However, guest file recovery of these VMs is not currently supported.

• VMs that are encrypted by Azure Key Vault. Backups of these VMs can include the operating system information, the data disks information, secrets (for example, token and password information), and encryption keys (for example, algorithm information). The encryption keys can be managed by Microsoft or by customers.

• For Azure-managed disks, information about the configured Availability Zones, which are specific (physical) locations within an Azure region.

• Azure-managed disks that are enabled with encryption at the host, on Windows or Linux VMs.

• Extensions that are associated with backed-up VMs.

• Application security groups that are associated with backed-up VMs.

• Proximity placement groups.

What Does Not Get Backed Up

• Temporary disks that are automatically configured by Azure when a VM is created

• Files or network drives that are shared in Azure and mounted on a VM

• Azure Ultra SSD-managed disks

  Due to a Microsoft limitation, snapshots of Ultra SSD-managed disks are not supported. When Ultra SSD-managed disks reside on a VM with other supported disks, during backups, the Ultra SSD-managed disks are skipped. The other disks on the VM are backed up.

  You can back up your Ultra SSD-managed disks using the Windows File System Agent. For more information, see Backups Using the Windows File System Agent.

Known Issues

• Azure snapshots that were taken with a locked resource group cannot be deleted.