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When you schedule an Ntbackup.exe task to run under a backup operator's credentials, the job may not complete if someone other than the backup operator is logged on to the console, and the System Event log may contain the following error entry:
Event Type: Error Event Source: DCOM Event ID: 10002 Description: Access denied attempting to launch a DCOM Server.
The backup operator does not have sufficient permissions to start the scheduled task when another user is interactively logged on.
To work around this problem, use either of the following methods.
Schedule the backup job to run under an administrators credentials.
Use the Dcomcnfg.exe program to grant backup operators launch permissions for Removable Storage Manager:
Start Dcomcnfg.exe, and click Component Services. Click Computers, click My Computer, and then click DCOM config.
Right-click Removable Storage Manager, and then click Properties.
On the Security tab, click Edit under Launch Permissions, and then add the backup operators group.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.