This portable device came in handy as we recently upgraded our computer system to a current iMac 27". (Be aware that you need to have a Mac with a Thunderbolt port to use this.)
The set comes with:
One 1TB/ 7200 rpm HDD
One Thunderbolt cable.
We've been in the habit of saving our OS by both Time Machine as well as Carbon Copy. Initially, we used a 1 TB harddrive that has a USB 2.0 port but this Thunderbolt- enabled drive is more practical. First, the USB runs considerably slower than this Thunderbolt drive and two, it frees up a USB port.
The unit also has a very modest footprint at 5" x 3.25" x 1.25" and it weighs just a bit over one pound.
If you're working with video or any intensive processing app, having the speed and storage space like the one here makes very good sense.