The application itself doesn't need to be installed and is very small. That makes it to be portable. When you run the program you will realize something is different, the folder where you'll save data will be perfectly organised.
You can modify settings to make the application suit your needs and decide if only new files will be copied, protect certain files, etc. USBFlashCopy is a good application if you want to backup files stored in USB removable drives. Thanks to USBFlashGuard you will have data stored in both the device and your HD.