WD My Book USB 3.0 desktop hard drive and auto backup software. The My Book desktop hard drive is designed to complement your personal style with a massive amount of space to store your photos, videos, music and documents. Complete backup, time machine-compatible, equipped with WD backup software for Windows and Apple time machine compatibility for Mac, the My Book desktop hard drive can back up your photos, videos, music and documents. The My Book desktop hard drive also works great with Acronis True Image WD edition software to schedule full system backups. Password protection with hardware encryption with built-in 256-bit AES hardware encryption with WD security software, you can set your own personalized password to help keep your content private and safe. Easy to use ready to use out of the box, start transferring files, saving memories and backing up. WD backup and WD security software are included to help protect your data. The My Book drive is also compatible with Apple time machine.