UPS or the Uninterruptible Power Supply is a very important gadget to own to protect personal computers from software and hardware error, data loss and system corruption.
The on-battery runtime of most uninterruptible power sources is relatively short which is only 5–15 minutes being typical for smaller units, but sufficient to allow time to bring an auxiliary power source on line, or to properly shut down the protected equipment.
When I was still running an Internet Cafe business, I am using UPS for my Server PC to protect it from system errors and corruption. During brownouts, I have no problem in logging out my customers, and charging them the right amount they need to pay according to their usage.
At home, I also use UPS for our computers, especially on my laptop where all of my blogging files are kept. Although, I used to do file back-ups in weekly basis but, it is still annoying and inconvenient formatting or troubleshooting and fixing errors if you can get rid of the problem.
Aside from keeping your equipments safe due to power interruptions, it also protect equipments from sudden power fluctuations.