1. Open the Settings app from the home screen.  

2. Scroll to the iCloud option and tap on it.

3. On the right-hand pane scroll to Backup and tap on it.

4. In the backup section ensure that the iCloud Backup toggle is green, this denotes that the iCloud backups are on.

5. Your iPad will backup automatically when on charge and can also be manually launched by tapping on Back Up Now.