In message , at 15:46:34 on Mon, 29
May 2017, Neil Williams remarked:

That's why it's not wise to make precise accusations at this stage.
Of
course, any professional data centre shouldn't collapse for most of a day
if there's a power supply problem. It should have UPS
But unlikely to have hours worth of UPS.

If it's business-critical, generators to power for an indefinite period
(provided fuel is added) should be present.

Yes, but that's not a UPS.
--
Roland Perry