You install a custom application on a computer that runs Microsoft Windows XP. The application stores each user’s data in the %programfiles%/app1/data folder on the computer. You install the custom application on a computer that runs Windows Vista. On the Windows Vista computer, you back up the %programfiles%/app1/data folder and notice that the backup contains no data. You need to back up the application’s user data on the Windows Vista computer. What should you do?（）

• A、A
• B、B
• C、C
• D、D