In a Windows Phone after signing in with your Microsoft account, you can turn on backup services that lets you automatically save important things such as your contacts, messages, apps you have installed in your phone etc. So you have backup if something happens to your phone.
Please Note:
- This article is basically for WindowsPhone 8.1 but even if you have WindowsPhone 8, the method to take backup is almost same.
- You will need internet in your mobile to take backup.