How do I save my entire MS Outlook address book to a disk for backup?

If you are worried about your pc's condition, I'd recommend you to purchase Acronis True Image 10. Because by using ATI 10 you can backup not only Outlook files but also your whole system including media files.

new true image home 10 can make outlook backups:

Outlook backup — Preserve your emails, contacts, calendar, tasks, notes, signatures, news folders, e-mail rules and user settings with just a few mouse clicks

The best is do backup to a server.

Try Mozy. They give 2 GB for free for online backup.

Is encrypted and fully automatized.

https://mozy.com/?code=94HW8M

you need to go to file then export and export to a file (pst) then copy that file on a disk or cd

PST it.