Espionage keeps data safe from spying eyes

March 08, 2010, 2:17 PM — Mac OS X's FileVault feature, which encrypts your entire user folder, is great for security. But because it stores your entire user folder as an encrypted disk image, it adversely affects performance, makes backups difficult, and--worst of all--can render all your data inaccessible if something bad ever happens to the monolithic encrypted disk image hosting your account.