In a previous life the company I worked for had a development site (where all non-production systems lived). When the UPS died we just left all of the hardware on raw supply. For the next three years the site lost power twice, once due to bad weather and the second time due to the FM flicking the wrong switch (the FM always gets the blame). The fault rate on the hardware was no higher than normal and this site had no surge diverters.
Dual site operation is the same, with or without the UPS, remember this is the purpose for which it was designed.
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