Backup Exec 2014 SQL Express or Full SQL

Installing a new Backup Exec 2014 enviroment.  2 Servers, one at our HQ site and one at our DR site.  I will be backing up about 15 VMware VM's, Exchange, SQL, a Domain controller, and some file servers at the HQ site to disk backup.  In that same backup I would like to send it out to our DR site to the BE server out there.

My assumption is that I will be using de-duplication, vs just plain disk storage.  Is SQL Express going to work for my setup or should I use full blown SQL for the Backup Exec database?

Thanks!