# Attaching a Disk to an Existing VM

You can restore a Hyper-V VM backup and attach the disk to an existing VM. The OS disk and data disks of the original instance are attached to the destination VM as data disks.

## Procedure

### Select the Disk to Restore

1. From the Command Center navigation pane, go to Protect > Virtual machines.

   The Overview page appears.

2. On the Virtual machines tab, click the VM that contains the disk.

   The VM properties page appears.

3. In the Recovery points area, select a recovery point.

4. Click Restore.

   The Select restore type page appears.

5. Click Attach disk to VM.

   The Attach disk to existing VM page appears.

6. To select a specific MediaAgent and/or source for the restore, in the upper-right area of the page, click the Change source button.

   The Change source dialog box appears.

   - Restore from copy: With the default value of Automatic, the software searches for the requested data in the primary copy. If the data is not found in the primary copy, the software selects a secondary or auxiliary copy.

   - MediaAgent: With the default value of Automatic, software attempts to use the MediaAgent that performed the backup.

7. Select the disk to restore.

8. Click Restore.

   The Restore options dialog box appears.

### Restore a Disk to an Existing VM (Admin Users Only)

The following steps are completed on the Other Virtual Machine tab, which is available only to admin users and not visible to end users.

You can attach a disk to an existing virtual machine in Hyper-V.

1. For Destination, select the Hyper-V host to which the disk will be restored.

2. For Access node, select an access node or an access node group.

3. For Destination VM, select the VM to restore the disk to.

4. For Disk provisioning, select an option to determine how storage space is allocated for the virtual disk when it’s created or restored on a Hyper-V host:

   - Auto: The system automatically selects the provisioning type based on the source or environment.

   - Dynamic: Disk space is allocated as data is written.

   - Fixed: The full disk size is allocated immediately.

     Note

     For Hyper-V live recovery operations, changing the disk provisioning type of VHD disks during restore is not supported. The restored disk must use the same provisioning type (Fixed or Dynamic) as the source disk. Converting between Fixed and Dynamic disk types during restore is not supported and may result in restore failures or conflicts.

5. For Disk options, select the format and allocation method of the restored virtual disk:

   - Disk name: Enter the name of the virtual disk (VHDX) file that will be created on the destination host.

   - Destination folder: Choose the path on the destination Hyper-V host where the restored disk file will be placed. You can click on the Folder icon to select another path.

6. Unconditionally overwrite if it already exists: Delete an existing VM and replace it with the restored VM.

7. Notify user on job completion: Receive an email notification that the restore is complete.

8. Click Submit.

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