This is the default feature for the plugin. Each time a user inserts text into the input. Each entry will be store into an array that can belater use to restore its value.
This feature allows to keep the input values in the browser local storage. If you close or refresh the web page you could still have access to the input values
This feature uses the RESTful filosofy, so the values may be store in a database. If you use your browser debugger tool, you could see that the input is making a GET request when it initializes, an UPDATE request when you change the input's value and a DELETE request when using the deleteStorage() public method.