CTERA Networks, an Israeli startup, has launched a storage service that combines network-attached storage with online backup. CTERA, which has raised an undisclosed amount from Benchmark Capital, sells an appliance that turns any external USB hard drive into a NAS device with automatic backup. This gives people copies of their data on their backup drive as well as in the cloud. It has a few differences from the other storage options out there, such as being able to back up information while the computer is turned off, but it still will face a battle to differentiate itself and win profits in the crowded space.