There are two kinds of computer owners: those that backup their data, and those who will backup after they lose something irreplaceable. It's that last group for whom World Backup Day exists, and the special occasion has returned for a third year to make sure we all wind up in that first, very responsible camp. Thankfully, it's easier than ever to have at least some kind of safety net. Along with ridiculously high-capacity external hard drives, both Mac and Windows users have simple built-in software to make backup a set-it-and-forget-it affair. No money or room for an extra drive on the desk? No problem: cloud storage is ubiquitous, and even includes unlimited options. Mobile users have it a little easier with a myriad of Apple, Google and Microsoft cloud services, although there's third-party options in that space, too. In short, you've got few excuses to skimp out when it comes to safeguards, and enough choices to seriously consider using two or more -- which might be wise in this dangerous era of meteorite showers and brick-tossing robots.