Keep documents on the school server and on your website. If one goes down, the other might still be available. Just in case both are down at the same time, make a class set as an extra back-up.

Save every version of developing essays or products. Give them file names that include class designation, group designation, and/or student initials. Never use spaces. Mark the final version with an "f" in front of the file name.

Save five times: to the student's box on teh server, to your box on the server, to the desktop, to disk or rewritable CD, and then have the student email it to herself for safe keeping.