Virtual BE Servers in VMWare Hotadd mode

hi

i got 10 ESX Host with VMs on Local Storage ( Not SAN), all of my ESX hosts  have HBA and they are Connected to SAN Switch ., also i got 1 vCenter that managing Virtual Infrastructure.

when i use Hotadd Mode for backuing up my VM's Do i need to have 10 BE server or 1 BE on a Host is ok?