I archive my backups on different disks, the Trekstor (eg for photos) is perfect. I must create my ear to hear. The exterior of the "current" silver acts to even noble. As a permanent data carrier in continuous operation, the plate is hot only after some time, but never gives the feeling that you could use it for cooking, so is likely to crash. A minor from the hard drives by the way I use my PS3 as an external disk. To this end, the Trekstor is also well suited. Because of its very handy dimensions (optics), they can also easily "disappear" so they barely noticeable. But in order to do it really wrong, because it is so beautiful smart.
The disadvantage with the required two USB ports I have solved that I (active!) USB plug have connected to a USB port on a laptop 4-fold. So no precious slot is claimed, and I have the certainty that the HDD receives sufficient power.
Although I personally believe that hard drives in its current form are not permanent "survive" as powerful drives with ever-increasing capacities are on the way and the hard drives will displace; until further notice so has a handy disk but definitely their right to exist!
Strong buy recommendation!