Backup Exec 2012 - Deduplication option

Hi,

I got a backup exec 2012 media server  protecting few server running Windows 2008 R2 Hyper-V.

How does symantec license the deduplication option?

Do i need to purchase one (1) deduplication option or do I need to buy the option for each server protected by Symantec BE 2012 ?

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I need to replicate my backups to a second site. On my second site I plan to deploy a second BE 2012 media server.

What do I need ? A bit confused on the licensing on replication.

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I have a Dell EQL PS4100xv, is there anyway to backup the data via iSCSI network directly to my backup server or tape drive, rather than passing through the normal LAN.

For Netbackup, I'm sure this possible with Enterprise client (includes SAN client) but for backup exec 2012, is this even possible?

Thanks,

Paul