In order to back up your progress in the game, you need to use a Google+ account. Please note that Google+ only supports one game per account, and that you will need a different Google+ account for each new game you play on other devices.
To connect your village, open the Google+ app on your device and make sure you are logged in. After, open Clash of Clans and go to the in-game setting. Press the Google+ sign in button to connect your village to Google+.
Devices that do not support Google+ also cannot be used for saving a backup. Clash of Clans does not support emulators, and it is not possible to recover a lost village if you are using are playing on a Blackberry, Nokia X-Series, Kindle HD, or any other platform that is not supported by the game.
source : supercell player support.