The Western Digital 6TB My Book External Hard Drive makes it easy to store and backup your critical files. WD Backup software automatically backs up all your data quietly in the background, so you don't have to do it manually. It lets you set your own schedule. You can also save your data in the cloud. The password protection and 256-bit AES hardware encryption offer another layer of security, so you can have peace of mind. My Book supports USB 3.0 and USB 2.0 connectivity on Windows PC. It can also be reformatted to work with Mac hardware.