[xdude]

Where I live having a UPS (Uninterruptible power supply) is kind of mandatory for every Desktop computer. We don't have long power outages but sometimes it fluctuate whole day. This can be very bad for Hard drives which I know from personal experience. I'm using a UPS with dual batteries. It gives me enough time to sort out everything and shutdown the computer property if it's a power failure. Also it keeps the computer safe from those annoying fluctuates.

Here single batter UPS cost about 30 usd and dual battery one is about 50 usd.