Netbackup 7.1 - Windows 2003

ESX vSphere 4.1

I plan on backing up a new VMware environment using the Netbackup VMware off host backup method. 

We already have a media server at this site with an LT04 tape library attached, however, it isn’t fibre connected to the same SAN as the ESX environment, so therefore can’t access the ESX datastores.

What I’d like to do is connect a new windows server to the ESX SAN that would act as the VMware backup host, which would then forward the backup data onto the media server via the network. (I decided against using a VMware guest as the VMware backup host)

Is this setup correct?  In other configurations, at other sites, the media server has been the VMware backup host, so I’d like to ensure this config is correct 

Also with this particular setup, I want to confirm that I only need to install the Netbackup client software on the VMware backup host and not the full server software?

Licensing wise and please correct me If I’m wrong, I’m pretty sure I require an Enterprise client licence for each ESX host, and a Netbackup client licence for the VMware backup host.

Thanks

JB