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Backups

Commvault backs up all of the virtual machines identified on the Content tab for a subclient, including virtual machines deployed in Azure Stack.

When a virtual machine is discovered during backup, a client for the VM is created in the CommCell Console if one does not already exist. If a virtual machine with spaces or special characters in its name is discovered during backup, the spaces or special characters are replaced with underscores ('_') when creating the VM client name that is displayed in the CommCell Console. The VM name with spaces or special characters is still displayed on the Virtual Machine Status tab for the backup job, in the backup job summary, and in reports that include the VM name. The following special characters are replaced:

[ \ \ | ` ~ ! @ # $ % ^ & * + = < > ? , { } ( ) : ; ' \ " \ \ s / ]

What Gets Backed Up

The following items are included in backups:

  • Virtual machines deployed in Azure Stack (powered on or powered off)
  • Disks configured by users through the Azure Stack portal
  • Azure Stack unmanaged disks. From these backups, you can restore full virtual machines and restore guest files and folders.

What Does Not Get Backed Up

The following items are not included in backups:

  • Files or network drives that are shared in Azure Stack and mounted on a virtual machine.
  • (Microsoft Azure limitation) If a VM is deployed through a template using dynamic disks, the VM is not protected and the backup job fails.

Backup Process

The backup operation includes the following stages:

  1. Discover virtual machine in the Azure Stack cloud based on subclient settings.
  2. Create a client computer entry for each virtual machine discovered.
  3. Identify the virtual machines targeted for backup and the VSA proxies that can be used to perform backups. VSA proxies can be installed on Azure Stack virtual machines or on local physical or virtual machines.
  4. Identify the disks associated with virtual machines targeted for backup.
  5. Assign backup streams to proxies in round-robin sequence.
  6. Use the Virtual Server Agent (VSA) to communicate with Azure Stack to download data.
  7. Create virtual machine snapshots in the Azure Stack cloud. By default, Azure Stack backups are crash consistent backups.
  8. Clean up the Azure Stack mount point, and complete the backup job.  

Backup Types

You can perform the following types of backups, either immediately or on a schedule.

  • Full backups: Back up the entire virtual machine. This is the most comprehensive backup.
  • Incremental backups: Back up virtual machine data that has changed since the most recent backup.
  • Synthetic Full backups: Consolidate virtual machine data from the most recent full backup with subsequent incremental backups.

For more information on backup types, see Backup Options.

Last modified: 8/28/2019 8:36:35 PM