1. Open the Control Panel Home window from Start / Settings / Control Panel
2. Click Backup and Restore Center
3. Click Back up files button
   
4. Select location where you want to save your backed up files
5. Select disks that you want to include in the backup
6. Select type of files to include in your backup
7. Create a backup schedule
8. Click the Save settings and start backup button

Alternatively, you can create a complete backup of your entire computer by clicking the Back up computer button and follow the simple wizard :)