razmatazWhy not use a sync tool to replicate the data?
arobarBecause we paid for a management portal, and it's easier to manage your IT when everything relating to IT is inside that portal. It's the same argument for getting BUDR over StorageCraft, or KES over any other AV. Integration is nice.
To answer the original question, yes, you can do this. When you're setting up the off-site server, enter the local LAN IP of the third server. Then, setup local servers on each of the other two off-site servers and tell them to off-site their data to the third server. It's tough to explain this in a readable manner...
Esentially, just set it up like normal, using the internal IP address of the third server instead of an external IP like you would have for other off-site locations. It is definitely possible to use the "off-site" function to replicate data within a LAN. We're doing this, and it works fine.