There are many ways to store data externally. In a school there are many good reasons to use external storage. For one, the student may take it from computer to computer. Another advantage is that the school can lock up the devices in a secured area at night. What makes the WiebeTech enclosure special is that it is built for rough use and for fast connection speeds.
These units would be excellent for a multimedia lab, storing sensitive information, and for backups. Just remember to use encryption if you are storing sensitive information. These devices are portable.