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This article applies to Sharepoint 2013 only.

Backups and/or backup set validation fails with the following error:

Application writer's data is not available. Please check the application writer status.

Further investigation into LogFile.txt, found in the \Debug\ folder of your installation directory, will reveal the following:

4732:4844:20/6/2013:03:21:21:676::AddWritersVolumestoList : Find writer SharePoint Services Writer
4732:4844:20/6/2013:03:21:21:676::AddWritersVolumestoList : Found writer SharePoint Services Writer
4732:4844:20/6/2013:03:21:21:676::CZWCJobHandler::VerifyDependentWriter : Dependent Sharepoint search writer not found
4732:4844:20/6/2013:03:21:21:676::CZWCJobHandler : Leaving ExecuteValidateDiskListJob

The timestamp will vary, but the messages will be the same.

What's going on?

Sharepoint 2013 backups require that the OSearch15 VSS Writer be enabled and accessible.


Open an elevated command prompt and enter the following command:

vssadmin list writers

After a short delay, information about the various VSS writers will be displayed. Look for the OSearch 15 VSS Writer in the list.

If the OSearch 15 VSS Writer is missing, please do the following:

  1. Open the start menu and type regedit to open the registry editor
  2. Locate the following key:
    1. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\VSS\Diag\OSearch15 VSS Writer


  3. Right click the key and choose Permissions...
  4. Add Full Control to the user account that launches the Sharepoint Server Search 15 service
    1. In most cases, the Network Service account is the correct account.
    2. If you are unsure:
      1. Open Windows Services and locate the Sharepoint Server Search 15 service.
      2. Right click the Sharepoint Server Search 15 and choose Properties.
      3. Go to the Log On tab. The account that launches the service will be displayed.

After adding the permissions, go back to the elevated command prompt and once again enter the command:

vssadmin list writers

The OSearch 15 VSS Writer should now be listed. Test your backups again.

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