I would use an Array to store all the data, then output it as a JSON string. You could have them cut and paste it to an email to send to you, or you could have the game upload it to a server to save.
The manual Array Download expression is actually defined as:
"Invokes a browser download of a file containing the Array's contents in JSON format. This is intended for offline development, e.g. creating level editors."
See Download, Load, & AsJSON.