You can now save and load your games straight on the server.
You need to have registered a free account and to be logged in to save your game !!!
Just press F1 during gameplay to SAVE your game.Just press F2 during gamplay to LOAD your saved game.
Also, you can press F3 to reset the current game without reloading.
These features are quite new are should be considered as BETA.
Please give it a try and report bugs if any :)