A quality UPS will save you time and money in the long run. It’s believed that bad power is the source of “hidden” corruptions that cause short term and long term problems. As one simplified example, imagine you were writing to a spinning media disk when the power dips… and the RPM of the disk slips… that could cause that write to end up somewhere it wasn’t supposed to, and it might be many days or weeks before you access the unintended target and find the problem.
There are at least three kinds of UPSes ( Uninterruptible power supply - Wikipedia ):
- There are ones that stay “off” the power line until they sense a problem, and then try to quickly jump in and address the problem.
- There are ones that are “line interactive” (I think one brand uses that phrasing.) They are always “on” the power line, but don’t use the battery unless insufficient power is arriving.
- There are fully online UPSes. They are always generating their own sine wave from the battery, and the incoming power is used to replenish the battery.
The last type is probably technically the best, as they are also usually the most expensive. There is one potential problem however. Generating a “proper” sine wave is technically challenging, and so they frequently “fudge” it. (Some cheaper ones even use a square wave.) This fudged signal has been known to physically break (aka “fry”) devices that were only designed for a proper sine wave.
Another issue to be aware of, is that a UPS uses a battery, which is a “consumable.” It will wear out over time, and need to be replaced. (Or else the whole UPS will need to be replaced, which of course replaces the battery.) These batteries are frequently proprietary, which makes them more expensive to replace than if they were generic.
I have had good experiences with CyberPower and APC. I have yet to replace a battery in my CyberPower units, as they’re all under 5 years old. I have successfully replaced the batteries in a couple of older APC units, at a cost that is barely cheaper than replacing the entire unit.