Isn't it possible to run two or more jobs simultaneously for the same storage in BE 2012? If not then what is the correct procedure for it?
Is this B2D? If so than yes, go into the b2d properties and set concurrent jobs to a number greater than 1. see the attached image. It is recommended that you test adding concurrent sessions one at a time to see how this affects performance and usually running no more than 5 jobs max.
also here is a link for Backup Exec 2012 B2D Best Practices http://www.symantec.com/business/support/index?page=content&id=TECH164267