Nothing comes free with an Appliance!
Your easiest option would be to have 12TB capacity and 12 TB of de-dupe - just two licenses and you will get OpsCenter Analytics thrown into the deal for you
I say 12TB to allow for growth but if you can afford to buy more then do so as you will always get the best deal the first time you go for this sort of deal
If you have existing traditional licenses then you will be able to trade them in against the price
Once you have these licenses you will have everything you need and can backup up and many clients, SAN Clinets, VMWare, agents etc. etc as you like up to the Front End Capacity limit if your license
For the support options, as well as the license options, speak to your Symantec Partner to see what they can do for you
Hope this helps
