Where does the plugin save users?

Hello everyone, I just started developing around this plugin and am finding it really useful to the point where I’m considering purchasing the full version. However I would like to scale up eventually and am curious as to where the plugin saves the user data as I’d like to develop plugins/code of my own at a later date to parse the information. I thought it would create a Mysql database in my FTP or something like that. My technical expertise is a bit limited so I would really appreciate the help please. Thank you and have a good day.