In order to back up your progress in the game, you need to use a Google Play account. Please note that Google Play 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 Play 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 Play 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.