When redirecting the restore of an Exchange 2010 Database, the restore may ignore settings and can potentially overwrite the original database. If the database does not get overwritten it may be in a dismounted state after restore.
Backup Exec may ignore the redirect setting, and then dismount and possibly overwrite the Exchange database. This condition only occurs if the Backup Exec system account password was changed since the initial installation.
A hotfix is now available for this issue in the current version(s) of the product(s) mentioned in this article. Refer to the Hotfix link under Related Articles at the end of this article to obtain the hotfix needed to resolve the issue.
Backup Exec 2012 Rev 1798 Hotfix 205111 (TECH205111)
Backup Exec 2012
Exchange Agent Option