D9's Auto Backup for Windows

The description of D9's Auto Backup - Play With New Friends

The automated personal backup program designed to either backup or synchronise your files. Its aim is to be simple and portable. Connect a card (e.g. SD), flash memory (like usb flash drive), or an external hard drive and let it silently update your files. Supports one-way backup (from either the external device or the computer) and two-way synchronisation (newest files overwrite the older ones).