The Lexar Echo ZE backup drive is the tiniest USB drive I’ve seen – no bigger than the “nano” receiver for my wireless mouse. It’s has a low-profile design – so small you can leave it plugged into the USB port all the time. It comes with Echo backup software that automatically encrypts and performs on-going backups of files in use. The Lexar Echo ZE comes in 8GB, 16GB, and 32GB capacities. The Echo ZE is compatible with Windows and Mac computers, and the Echo software works seamlessly to backup and restore files on either platform. You can order the Echo ZE from Lexar for $49.99 (8GB), $89.99 (16GB), or $139.99 (32GB).