Hello,
To enable an user account to create and run mailbox or public folders backup, following rights should be assigned to it :
- Local Administrator rights on the Exchange Server
- Admin role to the user account at the Site level (for all Sites if there is more than one) using Exchange Administrator utility (for Exchange 5.5)
Create an unique mailbox associated with the respective user account. Backup
Exec must have access to a uniquely named mailbox within the Exchange organization. When selecting mailboxes or public folders for backup, Backup Exec will attempt to find a mailbox with the same name (administrator) as the username stored in the Backup Exec logon account used to connect to the Exchange server. If you use a Backup Exec logon account that stores the credentials of a user account that is unique and has a corresponding mailbox of the same name, then you are not prompted for an additional logon account when selecting mailboxes or public folders. Otherwise, you must choose or create a Backup Exec logon account that stores the name of a unique mailbox within the Exchange organization
Kindly refer the following Documents:
"How to confirm that an Exchange mailbox name is unique within the Exchange organization when configuring Backup Exec to back up Exchange "
http://support.veritas.com/docs/256537
http://support.veritas.com/docs/243328
http://support.veritas.com/docs/236713
Thank You,
Shweta