Hi JanelParrish,
Unfortunately we do not have any documentation regarding how to send data to an external database. The process for doing so should be fairly straightforward, though. It is likely that all you will need to do in your project is to send a https message to your external server, which would handle the message and update the database. There is a plugin for the Engine that a community member made, VaRest, that may help simplify the process of sending the message using Json. Setting up how your server processes the incoming message and inserts the data into the database would be up to you.