diff --git a/src/conf/schemas/domainbackup.rng b/src/conf/schemas/domainbackup.rng
index bfc29a6c06..80ba155aad 100644
--- a/src/conf/schemas/domainbackup.rng
+++ b/src/conf/schemas/domainbackup.rng
@@ -166,6 +166,10 @@
                   <value>no</value>
                 </attribute>
               </group>
+              <!-- Allow to plainly select a disk for backup without any other config -->
+              <group>
+                <ref name="backupAttr"/>
+              </group>
               <group>
                 <ref name="backupAttr"/>
                 <attribute name="type">
diff --git a/tests/domainbackupxml2xmlin/backup-push.xml b/tests/domainbackupxml2xmlin/backup-push.xml
index a95833d407..f1cb38fa82 100644
--- a/tests/domainbackupxml2xmlin/backup-push.xml
+++ b/tests/domainbackupxml2xmlin/backup-push.xml
@@ -6,6 +6,8 @@
       <target file='/path/to/file'/>
     </disk>
     <disk name='vdb' type='file' backupmode='full'/>
+    <disk name='vdc'/>
+    <disk name='vdd' backup='yes'/>
     <disk name='hda' backup='no'/>
   </disks>
 </domainbackup>
diff --git a/tests/domainbackupxml2xmlout/backup-push.xml b/tests/domainbackupxml2xmlout/backup-push.xml
index fff7db716b..0c6fa6d4ee 100644
--- a/tests/domainbackupxml2xmlout/backup-push.xml
+++ b/tests/domainbackupxml2xmlout/backup-push.xml
@@ -8,6 +8,12 @@
     <disk name='vdb' backup='yes' type='file' backupmode='full'>
       <target file='/fake/vdb.qcow2.SUFFIX'/>
     </disk>
+    <disk name='vdc' backup='yes' type='file' backupmode='incremental' incremental='1525889631'>
+      <target file='/fake/vdc.qcow2.SUFFIX'/>
+    </disk>
+    <disk name='vdd' backup='yes' type='file' backupmode='incremental' incremental='1525889631'>
+      <target file='/fake/vdd.qcow2.SUFFIX'/>
+    </disk>
     <disk name='hda' backup='no'/>
     <disk name='vdextradisk' backup='no'/>
   </disks>