How to calculate UPS battery backup

It is nearly impossible to know when the next power outage will occur and frankly, they can be rather damaging unless you have the tendency to save your work every 2 minutes. I remember I have been working on this Photoshop file for nearly two hours, and a power outage came and erased everything I worked on – the next day I went to the market and bought an UPS. Now, before I bore you with useless stories let us see what you can find within this article: