QNAP QBack-25 HDD Enclosure
 

The QNAP QBack-25 is an external HDD enclosure for 2.5inch HDDs connected via USB. The use of 2.5inch drives allows that it is powered by USB only. What makes the unit special is the included backup software which can easily compete with professional solutions. It is very easy to use and has a clean screen layout. Optional 256-bit AES encryption helps you protect your data from prying eyes. With a price of about $35 this unit is also very competitively priced.

http://www.techpowerup.com/reviews/QNAP/QBack25