<domainbackup mode="push">
  <incremental>1525889631</incremental>
  <disks>
    <disk name='vda' type='file'>
      <driver type='raw'/>
      <target file='/path/to/file'>
        <seclabel model='dac' relabel='no'/>
      </target>
    </disk>
    <disk name='vdb' type='block'>
      <driver type='qcow2'/>
      <target dev='/dev/block'>
        <seclabel model='dac' relabel='no'/>
      </target>
    </disk>
  </disks>
</domainbackup>