You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation.  What should you do？（）

• A、Create a System Restore point.
• B、Perform an Automated System Recovery （ASR） backup and restore.
• C、In the Backup and Restore Center window， click the Back up files button.
• D、In the Backup and Restore Center window， click the Back up computer button.