4TB Backup Plus. Windows 7 or higher, or Mac OS X 10.9 or higher operating system1,2 SuperSpeed USB 3.0 port (required for USB 3.0 transfer speeds or backwards compatible with USB 2.0 ports at USB 2.0 transfer speeds)2 Seagate Mobile Backup app system requirements: iOS 8 or higher, Android 3.0 or higher