PLEASE READ before participating in the Minecraft Beta:

Joining the beta will replace your game with a work in progress version of Minecraft

You will not have access to Realms and will not be able to join non-beta players while you're previewing the beta

Any worlds played while in the beta cannot be opened in previous versions of the game so please make copies of worlds to prevent losing them

Beta builds can be unstable and are not representative of final version quality