Jobs fail to backup Shadow Copy Components and System State

I'm running BE 2010 R2 on Windows 2008 Server R2, backing up to a Dell PowerVault TL-2000 with two IBM drives (Library Extension Option is licensed)

I have two jobs (Full & Incremental) to do file, folder, shadow copy components and system state backups for a Windows 2003 Enterprise x64 server running Microsoft SQL Server 2005.

Databases and transaction logs get backed up via other jobs.

The file and folder jobs fail with the following error:

 - AOFO: Initialization failure on: "\\xxxxxx\Shadow?Copy?Components". Advanced Open File Option used: Microsoft Volume Shadow Copy Service (VSS).

V-79-10000-11217 - VSS Snapshot error. The Microsoft Volume Shadow Copy Service (VSS) snapshot failed. Make sure that all provider services and tasks are running. Check the Windows Event Viewer for details.

 - AOFO: Initialization failure on: "\\xxxxxx\System?State". Advanced Open File Option used: Microsoft Volume Shadow Copy Service (VSS).

V-79-10000-11217 - VSS Snapshot error. The Microsoft Volume Shadow Copy Service (VSS) snapshot failed. Make sure that all provider services and tasks are running. Check the Windows Event Viewer for details.

Logging on to the server in question i noticed that the Volume shadow Copy service is stopped, although its startup mode is Automatic. I manually started the service, however on that day the backups failed again with the same error. I logged on again to the server and found the service is stopped once again. At that time i saw that NetApp SnapManager for SQL Server is installed on the server, however upon investigating a bit more it turns out that its services are disabled and it's not actually being used to backup the databases.

Any ideas on how to troubleshoot this further? Could the BE agent somehow be trying to use the SnapManager VSS service to perform the Shadow Copy Components and System State backups and fails because SnapManager services are disabled?

Should I try to uninstall SnapManager and see if that will make the jobs revert to using Microsoft Volume Shadow Copy and complete the backups successfully?