Back Up Before Upgrading to Mojave or iOS 12
Poll a room of Apple experts about the one topic they can't stop talking about and many will launch into frustrated rants about how too few people back up. Backups are always important, since you can never predict when your Mac or iPhone will be lost or stolen, melt in a fire, or just break. But one time when backups are especially important is before you upgrade to a major new operating system. If you're thinking "What could go wrong?" the answer is, "Lots," and wouldn't you like to be...