How about a 1 Terabyte Thumb Drive? Well the Kingston DataTraveler HyperX Predator gives you a 1TB portable flash drive that has read speeds of 240MB/s and write speeds of 160MB/s.
Right now something like this costs well over $1000, but for a super compact backup device, that can be carried or kept on one's person. Priceless.
http://www.kingston.com/us/company/press/article/6487