Backup Exec (BE) support for Microsoft SharePoint Server 2013
Support to Backup and Restore SharePoint Server 2013 is added in:
Granular Restore (GRT) of SharePoint 2013 is only in BE 2014.
For BE 2012, A Full restore and Microsoft Steps can be used to extract content if needed. Please refer to this document for details - http://www.symantec.com/docs/TECH205370