You can document, and query live data from your data system by configuring a virtual connection to it. With a virtual connection, your data stays where it is--it is not hosted on data.world--so the data is always up to date and fresh.
Virtual connections to your data can be created through Connection manager, or from our Integrations for database connectors. The Connection manager is the best way to create a connection that will be owned by an organization. If you need a connection that you will own personally, you will need to create it from the integrations gallery. See the article on Connection permissions for more information about choosing an owner for a connection.