external harddrive Sooner or later, you’ll unintentionally overwrite your work, or worse yet, your equipment will fail or be stolen. Online back-up software came on strong last year, asking you to rent their space for a price. As a result, we examined vendors like SpiderOak, Carbonite, and others. But after months of experimenting, I concluded that online backups are just too slow. And with large hard drives dropping so low in price, I now recommend carrying a 1-, a 2-, or a 3- terabyte hard drive. It’s about the size of a small smart-phone. (We live in an amazing age, eh? USB sticks are another option, if you have a USB port on your device (all of them should!).