You can grant the Full Control permission for the Backup Exec service account at the Organization level.
See About granting permissions on the Exchange Server for the Backup Exec service account in the Archiving Option .
Refer to the Microsoft knowledge base for more information on this procedure.
To grant permissions at the Organization level for Exchange Server 2003 for the Archiving Option
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Configure the ShowSecurityPage registry setting to enable the display of the Security page.
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In the left pane of Microsoft Exchange System Manager, right-click the Exchange Organization, and then click Properties.
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Select the Backup Exec service account to add it to the list.
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In the Permissions list, ensure that all of the check boxes in the Allow column are selected.