The factor that should be considered in the physical design when implementing backup copy jobs between sites is to use physical servers for the Veeam backup proxies at each site. A Veeam backup proxy is a data mover component that performs data processing and transfer tasks for backup and backup copy jobs. A physical server is preferred over a virtual server for better performance, reliability, and isolation. A physical server can also leverage hardware encryption offload to reduce CPU load and network traffic encryption to secure data in transit.