The NetBackup Client Service must be authorized to run as the system administrator (Windows 2008) or the SharePoint administrator (Windows 2003). In Windows Services, configure the NetBackup Client Service properties for the host(s) where the Index Files or Index database(s) and where the document libraries reside. To change this account, you must have administrator group privileges.
To configure the log on account for the NetBackup Client Service
If Local System account is not selected as the Log on as account, proceed with step 8.
On the servers which have the content of the SharePoint farm, the account for the NetBackup Client Service should have the local security privilege. After this local security policy privilege is allowed for the account, run gpupdate /Force (group policy update) for this change to take effect.