Portable hard drives can be a great value if what you need is raw capacity above all else. You can find a 2TB portable hard drive for less than $100 with ease (possibly even a 4TB one, depending ...
The Seagate Expansion Portable 2TB external hard drive is USB-powered and weighs 181 grams. It offers a data transfer rate of 5120 Megabytes per second and works with both Windows and Mac devices.