Proper way to set up rsnapshot over ssh on multiple machines

I am using the answer in this post to part of my question: Proper way to set up rsnapshot over ssh However, this post is seven years old and also I have an additional question. I have the same scenario, except that I have a server B and a server C that need to use rsnapshot over ssh to back up to server A. Question: how can I set the rsnapshot configuration file to not confuse the two (server B and server C) in terms of storage, schedule (via cron), and so on?