For many people, a UPS falls into the murky gray area between need and want. If you have a desktop computer or network-attached storage, you may need a UPS to prevent your drives from losing data in the event of a sudden power outage. And if you have digital phone service through your broadband provider, and the company skimped on your equipment by not including a battery, you may need a UPS to power your phone modem during a blackout so that you can reach emergency services. But a UPS is also handy during mundane power outages, since it allows you to pass the time on Facebook or Netflix while you wait for the juice to return.
A UPS makes sense in a lot of scenarios, but not in all of them.
A UPS is one of those unsexy things you don’t know you need until you need it. If you live in an area with spotty power or frequent weather-related outages (I live in an old apartment building that frequently has power outages for seemingly no reason), a UPS can save a lot of aggravation and frustration.