If you need to share or transfer files between Linux machines, you have plenty of options. Here are some you might not have considered.

The config file for NFS service, /etc/exports, is more specific. On those two machines of the cat family, blackcat and tomcat, mount /home and /usr/doc directories via NFS: ...

NFS is on the hosts, but I just use it between the other hosts and my cloud backup VM, basically just for server-to-server duty rather than for client access. My apps are in containers, when possible.