diskAshur DT² iStorage - Click to see the full review

If you have data you want to ensure never gets into the wrong hands, the diskAshur DT² from iStorage is a USB 3.1 encrypted desktop hard drive with a ton of 007 features to prevent anyone from busting. With capacity options from 1TB up to a huge 12TB, it is the world's first and only NCSC CPA and NLNCSA BSPA certified encrypted desktop hard drive.

iStorage diskAshur Pro 1TB - Click to see the full review

Of all the portable storage devices I have reviewed during 2015 this is by far the most secure, to the point that this is what I now use to back up my own business data.  At the last company I worked for there were two instances where data was stolen by an ex-employee which led to the business losing thousands of pounds and creating hours of headaches so having a device that backs up all critical data with passwords and only known by the few who need to know is so important.