Instructions
 
Open the game's directory using Windows Explorer. The game install directory will be located wherever you selected during the installation process, or at the default path, "C:\Program Files\Activision\Call of Duty 2\." 
Double-click the "Main" folder to enter it, then double-click the "Players" folder to do the same. All profiles created using your computer will be displayed inside the folder. 
Right-click on your profile and select "Copy." 
Right-click in any other folder and click "Paste" to create a duplicate of your profile data, allowing you to restore your data if it ever becomes corrupted or lost through hard drive failure.