It's not needed. Veeam is a sole application, installed on a PC..physical or VM. It then 'sees' ESX/i host via vCenter or directly. The place you b/u your VMs can be on your SAN, but that SAN storage has to be assigned as a datastore to one of your hosts (again, either directly or via vCenter). Or, you can have some local storage on the box Veeam is installed on that you can b/u your VMs to.
~coolsport00