If you configure VBR Server to be installed remotely from virtual infrastructure, it`s recommended to create backup proxy on the infrastructure site to perform local backups.
So, create a proxy on the site A, create backup job to backup VMs locally and backup copy job to copy those restore points to the site B.
You are correct backup copy job
runs constantly, most of the time in idle state, waiting for a new restore point to appear on the source backup repository. There is no need to change it. Thanks!