Dropbox: It's free, the basic account can more than hold a semester's worth of work—short of a film school project—and it syncs to all your computers and to the web. "I accidentally deleted my homework" wasn't a very good excuse ten years ago and it's an unforgivable one now. You can sync your passwords, your OneNote notebooks, and access your favorite portable apps from anywhere.
Online Backup: While Dropbox is great for syncing files, if you want to go all out you'll definitely want to check out some full-fledged computer backup tools like Mozy and Carbonite. Check out our Hive Five on best Windows backup tools to get more information.
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"Young people also need guidance and adult assistance to learn how to safely navigate the virtual environments of the 21st Century. Schools must be proactive, rather than merely defensive, in helping students acquire the skills of digital citizenship needed today and in the future. Simply banning read/write web tools on school networks is an inadequate response: Educators must strive to learn alongside students and parents how these technologies can be safely and powerfully used to communicate and collaborate."