This will Help you to create a repository in GitHub and use it as project backup.
- Create a GitHub account use your mail id.
- Create a repository in GitHub.
- Copy the remote location with (.git) extension.
- Start Eclipse and Create an Android Project.
- Share the project with Git .
- Commit Your changes in local repository.
- Push the changes to the master branch.
- Make sure you push for every major change in the project