Most of them keep their important documents are in USB drive this may lost in many ways. USBFlashCopy is free software that will help you to automatically backup your data to hard drive when you insert them.
When you insert USB it copy contents and it creates a sub-folder for each removable media in “My Documents\Removable Media Backups”. USBFlashCopy copies only newer or updated files, you can optionally keep old versions of the files.
You can simply download and run USBFlashCopy. USBFlashCopy can be used almost on any PC that has 1 MB of free hard drive space and is running Microsoft Windows 2000/XP/XP 64bit/Vista/Vista 64 bit. Run USBFlashCopy from any folder or drive.