I currently do not have the full version of Minecraft, but I've been using the semi-glitch where you can get the full (though not multiplayer, and not updated) version of the game by turning off your WiFi and logging into the demo. I assume this is a pretty well-known way to get around the demo, seeing as I was able to find it on my own. As far as I can tell, the servers do not notice that I do not have the paid version of the game, and therefore still let me into offline mode.
Anyways, I would like to buy the full version sometime, but I was wondering if I would be able to transfer my saves from where they are now. I'm not even sure that I'm even using the demo version right now, which might mean that I'll lose all my save data. I've built up a pretty significant base, and that would really not be fun to redo. Does anyone have information on this?