Pogoplug Series 4 Backup Device Continuous, centralized backup of all of your computers (Windows or Mac) and iPhone, iPad or Android devices Backup continues even when you take your computers or devices away from your home or office Keep your files safely at home but access them from anywhere 60-second setup never worry about backing up again No storage limits and no additional fees when using your own external hard drive No PC required Includes 2 USB 3.0, 1 USB, 1 SD Card Slot, and 1 USM/SATA Slot