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Why would a user who is a member of the 'backup operator' group be unable to run a task? It simply does not start - there is no error that I can find. I changed the user of the Windows Server Backup from admin to svc_backup to avoid changing the password periodically in two places (svc_backup has a non expiring passsword) but the svc_backup user cannot start the backup task.

What can I check?

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Have you looked in the event log? – Ben Pilbrow Jan 22 '12 at 16:53
What is the error? – t1nt1n Jan 22 '12 at 16:53
What is it backing up? User data, systemstate or system files? – Mathias R. Jessen Jan 22 '12 at 17:12
Event viewer says: The backup operation that started at '‎2012‎-‎01‎-‎23T11:14:28.091199900Z' has failed because the Windows Server Backup engine could not be contacted, error code '2155413596'. Please confirm that the service is installed and enabled, and then rerun the backup operation.... – Alberto Jan 23 '12 at 11:18

Check that the Backup Operators group has been granted the "Logon as a batch job" windows right. This is the default, but may have been changed.

Also, try to right-click on the task and select Run to determine if it launches in that scenario.

I would also select "Run with highest privileges" and "Run whether the user is logged on or not".

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Double check everything but it doens't work... – Alberto Jan 23 '12 at 11:23

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