Knowledgebase: General
Failed to backup Open Files. Error in initialize VSSBackupAgent.

Event Log Error:

Error in check for Writer(remoting). Error: Error in Checking for VSS Writer, Error: Error in initialize VSSBackupAgent, the application might be missing one of its dependent assemblies. Error: Could not load file or assembly 'AlphaVSS.Win2008.x64, Version=1.0.9156.0, Culture=neutral, PublicKeyToken=3033cf2dbd31cad3' or one of its dependencies. The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log for more detail. (Exception from HRESULT: 0x800736B1)

Error in Backup Log:
-2147467261 Object reference not set to an instance of an object. on frmBackupSet.VssOpenFilesProcess

OS affected:
Windows 2008 64-bit, Windows Vista 64-bit, and maybe others.


1) Make sure 'AlphaVSS.Win2008.x64.dll' is present in the Endpoint's application folder (usually, C:\Program Files (x86)\Remote Backup). If no DLL is present, please contact support.

2) If Windows 2008 Server 64-bit (else, proceed to step 3), check if the following registry key is set to True -

HKEY_LOCAL_MACHINE\SOFTWARE\Quantum Tech, Inc.\Remote Backup\Settings: "ServerOS" - REG_SZ - "True"

If there is no registry key, close the Endpoint application and create a new registry key (String value) in the above branch, and called in 'ServerOS'. Set the value to True.

Restart the Endpoint application, and test.

3) IF the DLL in step 1 is present, and the registry key is set correctly, the system is most likely missing a VC++ DLL. Download the Microsoft Visual C++ redistributable from the link below, and install this on the server. After installation, restart the Endpoint application.

MS VC++ Redistributable Download:

(375 vote(s))
This article was helpful
This article was not helpful

Comments (0)
Post a new comment
Full Name:
Online Backup Software by Remote Backup Systems fusion