Secure storage £282, $389 www.drobo.com
The Mini is a RAID system, which enables data to be stored across several drives, so if a drive fails your data will remain safe. Setup is straightforward: add four 2.5-inch drives up to a total of 8TB and the Mini sorts out the configuration. Our tests showed read speeds of 400 megabytes per second and write speeds of 300 megabytes per second using a Thunderbolt connection, which is exceptionally fast. There’s little to fault with the Mini other than the price.