单项选择题 You need to ensure that you can recover system configuration and data if your computer hard disk fails. What should you do?（）

单项选择题 Your data recovery strategy must meet the following requirements: ·Back up all data files and folders in C:\Data. ·Restore individual files and folders in C:\Data. ·Ensure that data is backed up to and restored from external media. What should you do?（）

单项选择题 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?（）