Since data is kept inside the browser there wasn't an easy way to move your data between computers or browsers. With download you can now export your grow into a .json file which is just a text file with all your data. The upload button select a valid grow.json file and it will import it inside Sproutsheet.
These new features also makes it possible to share your grow files with others.
One of the ideas I am playing with is to provide a tool that makes it possible to share data your online. You can compare it pastebin.com but instead of just showing formatted text it would generate a report that has a similar layout as the Sproutsheet application.
Let me know what you think,