SQL resources are not listed under cluster name in backup selection list.
This issue will come up if hosts file on any of the SQL node has an entry for SQL cluster name pointing to IP address of the physical node.
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 Documents at the end of this article to obtain the hotfix needed to resolve the issue.
Backup Exec 2012 Rev 1798 Service Pack 2 (TECH203155)