WD's My Passport provides you with 4TB of blank space to store all your documents, photos and music. Its compact size means you can easily move it around the house or slip it in your briefcase to take to the office or library. Auto backup My Passport drive comes with WD Backup software, which enables you to set a time and frequency for automatic backup sessions. Password protection The integrated 256-bit AES Hardware Encryption with WD Security software is designed to keep you content private and secure. Before you take it out you can set up a return-if-found message as a password prompt in case you lose your My Passport.