Hello,
Are these standalone drives? If yes, then backup exec can support unlimited standalone drives and no additional license in needed. However if these are the two drives of a robotic library, then backup exec supports the first drive, but for every additional drive, a Library expansion option is needed.
You can run concurrent jobs on the two drives. Refer to the following technote for more information on this:
Title: How to run concurrent backup jobs with Backup Exec for Windows Servers
http://support.veritas.com/docs/245451
Hope this answers your question. Revert in case of doubts.
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Regards.