Situation 1:

The above permissions will need to be added to the backup account in the EV Authorization Manager.  
For more information on adding permissions and rights in the Authorization Manager refer to the Administrators Guide for EV 8.0.
 www.symantec.com/docs/TECH66548

Extract of Steps:
1. In the EV Admin console, right click on Directory on the EV server and select 'Authorization Manager...'.
2. Expand 'Definitions' then right click on 'Role Definitions' and select 'New Role Definition'.
3. Give the definition a name like 'Backup Role' or something else descriptive for the Backup role.
4. Click 'Add' to add tasks, click the 'Tasks' tab, and add both 'EVT manage Index Location Backup Mode' , 'EVT Manage Vault Store Backup Mode' and ' EVT Manage Vault Store'  
5. Click OK.
6. Right click on Role Assignments and select 'Assign Roles...' Locate the Role Definition you just created and check it.
7. Click OK.
8. Right click on the Role Assignment you created and select 'Assign Windows Users and Groups'.
9. Add the Backup Exec ID to the object list and click 'Check Names' to be sure that the name is resolved.
10. Click OK.