Choosing an adequate UPS

Anyone have any tips on choosing a UPS? Here's what I'm doing now:

I add up total power supply wattage stats of machines to be plugged in to the UPS and divide that by the output capacity wattage of the UPS. Based on that, I try to keep the result no higher than .60. If it's higher, time to get another UPS.

Is this a meaningful calculation?

Thanks for any links or advice.

 

 

 

 

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