Archive:Hyper-V Backup

From SEPsesam
SEP AG has discontinued support for obsolete SEP sesam versions. Instructions are still available for these SEP sesam products, however, SEP AG accepts no responsibility or liability for any errors or inaccuracies in the instructions or for the incorrect operation of obsolete SEP sesam software. It is strongly recommended that you update your SEP sesam software to the latest version. For the latest version of SEP sesam documentation, see documentation home.

Copyright © SEP AG 1999-2023. All rights reserved.

Any form of reproduction of the contents or parts of this manual is allowed only with the express written permission from SEP AG. When compiling and designing user documentation SEP AG uses great diligence and attempts to deliver accurate and correct information. However, SEP AG cannot issue a guarantee for the contents of this manual.


Microsoft provides a VSS Writer for Hyper-V Server to enable an online backup of virtual machines. If a backup is started with SEP sesam, snapshots of the virtual machines are created and then the .vhd files as well as the already created snapshots are backed up.

System requirements

  • Supported Versions
  • Install a SEP sesam backup client (since Version 4.0.3) on each Hyper-V host.
  • The backup client communication to the Sesam server has to work properly.
    • For that, register the client by Sesam GUI
    • Configure a backup task, e.g. source C:\temp ...
    • ... and perform the backup. If the backup has been executed successfully, the communication between Sesam server and Sesam client works properly.

Backup procedure

Create a new backup task for the Hyper-V client which contains the virtual machines.

Backup task hyperv en.jpg

After starting the backup, Hyper-V automatically creates snapshots for every active virtual machine.

Snapshot hyperv.JPG

Then the backup task starts for the defined machines.

Restore procedure to existing VM

In case of a restore the corresponding virtual machine must be turned off. Afterwards single volumes (.vhd files), snapshots or the whole virtual machine can be restored.

  • Example Restore of a single volume:

Restore hyperv.JPG

  • Example Restore Snapshots:

Restore hyperv snap.JPG

Restore procedure to new VM

To create a new VM with the backed up (.vhd files), the restored (.vhd files) must be added as an "existing virtual hard disk".

Hyperv different vm.png


Error message

  • Error: DB Module: [ [Failed at thaw] - VSS_E_WRITERERROR_TIMEOUT. [Microsoft Hyper-V VSS Writer] - VSS_E_WRITERERROR_TIMEOUT]
    • To resolve the issue install the following Microsoft service pack on the Hyper-V Node and also on each Microsoft VM running on that host
  • Error: VSS_E_SNAPSHOT_SET_IN_PROGRESS error and in the Windows Event logs VDS basic provider error
    • To resolve the issue install the following Microsoft service pack on the Hyper-V Node and also on each Microsoft VM running on that host