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Known Issue: Validation of Backup Set Fails for SharePoint Backup

Summary:

You receive an error message stating validation of backup failed, while attempting to perform SharePoint backups.

Cause:

This message indicates the VSS writer for SharePoint or SQL server is not available.

This article applies to:

Carbonite Plans Products Platforms
Power and Ultimate (Not sure?) Carbonite Safe Server Backup (Not sure?) Windows

Solution:

To resolve this problem, run the following commands from an elevated Windows Command Prompt:

  1. Click Start; All Programs; Accessories to locate the Command Prompt menu.
  2. Right-click it and select Run as administrator.
  3. Within the Administrator:Command Prompt window, type vssadmin list writers. If this does not display SharePoint VSS writer or SQL VSS writer, proceed to resolution #1.
  4. Change your directory to the [CSSB Directory]\bin\ and run vshadow.exe -wm2. If this does not display VSS writers metadata information, proceed to resolution #2.

    Note: The [CSSB Directory] is as follows:

    For new users

    • C:\Program Files\Carbonite\Carbonite Safe Server Backup (for 32-bit operating systems)
    • C:\Program Files\Carbonite\Carbonite Safe Server Backup(x64) (for 64-bit operating systems)

    For existing users

    • C:\Program Files\Carbonite\Carbonite Server Backup (for 32-bit operating systems)
    • C:\Program Files\Carbonite\Carbonite Server Backup(x64) (for 64-bit operating systems)

Resolution #1

  1. Start the SharePoint writer and/or SQL writer services if they are in the stopped state.
  2. If the SharePoint writer is in disabled state, re-register it using resolution #2.

Resolution #2

  1. Re-register SharePoint VSS writer by running these commands from an elevated Command Prompt:
    • Type stsadm -o unregisterwsswriter
    • Type stsadm -o registerwsswriter
  2. STSADM can be located in the following directory:
    • C:\Program Files\Common Files\microsoft shared\Web Server Extensions\[Version]\BIN\

Note: Your [Version] will vary depending on the version of SharePoint installed. For example, STSADM for SharePoint 2010 is located in C:\Program Files\Common Files\microsoft shared\Web Server Extensions\14\BIN\.

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