Step 1: Open the Control Panel
Step 2: Click Backup and Restore (Windows 7)
Step 3: Click on System and Security, select Set up a backup as shown.
Step 4: Select the external drive you want to use to store the backup.
Step 5: In the What do you want to backup? , Click Let me choose, to make sure everything is backed up.
Step 6: Check and tick the information you want to back up. You should select the full Data Files and Computer. Click the Include system of drives option: System Reserved, C:, then click Next.
Step 7: Check the information again, the Schedule is the time the system starts the automatic backup process. You can click Change schedule to change the time you want.
Step 8: Click Save settings and exit to finish.