Where we need to enable Bpfis log

Hi

My question is where we need to enable the bpfis log inorder to trouble shoot. I cam to know from the administrator guide that it should be enabled in the backup  Host

In our Infra we are running the backup of the Esx host through the media server "X". So do i need to enable in the media serve through which the backup is running or in the master

Your reply is greatly appreciated

Thanks