Kind of a lame article. He is complaining about his $50 consumer grade UPS. The minimum any server needs is the Apc SMT750 "Smart-ups". It takes two batteries, cheap ones last about 3 years, the replacements from APC can last between 5-7 years. But the unit can supply mains power with no battery connected and the batteries can be hot swapped easily from the front of the case. These are $300 new, but you can find them used on ebay between $50-$100.