<domainbackup mode="push">
  <incremental>1525889631</incremental>
  <disks>
    <disk name='vda' type='file'>
      <driver type='qcow2'/>
      <target file='/path/to/file'>
        <encryption format='luks'>
          <secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f'/>
        </encryption>
      </target>
    </disk>
    <disk name='vdb' type='file'>
      <driver type='raw'/>
      <target file='/path/to/file'>
        <encryption format='luks'>
          <secret type='passphrase' usage='/storage/backup/vdb'/>
        </encryption>
      </target>
    </disk>
    <disk name='vdc' type='block'>
      <driver type='qcow2'/>
      <target dev='/dev/block'>
        <encryption format='luks'>
          <secret type='passphrase' usage='/storage/backup/vdc'/>
        </encryption>
      </target>
    </disk>
  </disks>
</domainbackup>