Store once Catalyst to backup DMZ servers

Hi,  We need to backup  client in DMZ using Storeonce catalyst. The Storeonce is outside DMZ.  Expectation is no performance issue on firewall due to backup. Should we keep a Media server in DMZ and then use Catalyst over FC or                                      Should Keep Media server in DMZ , use server side dedup and backup over ethernet to Staoreonce catalyst. Any help would be appreciated.

Thanks| Raj