diff --git a/@xen-orchestra/backups/_VmBackup.js b/@xen-orchestra/backups/_VmBackup.js
index def616bdbab..def48ed081f 100644
--- a/@xen-orchestra/backups/_VmBackup.js
+++ b/@xen-orchestra/backups/_VmBackup.js
@@ -243,6 +243,11 @@ class VmBackup {
     const deltaExport = await exportDeltaVm(exportedVm, baseVm, {
       fullVdisRequired,
     })
+    // since NBD is network based, if one disk use nbd , all the disk use them
+    // except the suspended VDI
+    if (Object.values(deltaExport.streams).some(({ _nbd }) => _nbd)) {
+      Task.info('Transfer data using NBD')
+    }
     const sizeContainers = mapValues(deltaExport.streams, stream => watchStreamSize(stream))
 
     const timestamp = Date.now()
diff --git a/packages/vhd-lib/createStreamNbd.js b/packages/vhd-lib/createStreamNbd.js
index f8653de0419..ee4984b74b3 100644
--- a/packages/vhd-lib/createStreamNbd.js
+++ b/packages/vhd-lib/createStreamNbd.js
@@ -105,6 +105,7 @@ exports.createNbdVhdStream = async function createVhdStream(nbdClient, sourceStr
 
   const stream = Readable.from(iterator())
   stream.length = (offsetSector + blockSizeInSectors + 1) /* end footer */ * SECTOR_SIZE
+  stream._nbd = true
   stream.on('error', () => nbdClient.disconnect())
   stream.on('end', () => nbdClient.disconnect())
   return stream