In the architecture of a server solution, supply of electrical power is a single point of failure. If electrical power is lost, servers can fail without warning and software corruption can occur even with journaled file systems. UPS devices protect from voltage spikes, surges, overvoltage, undervoltage and other nastiness. They protect the most expensive and critical elements of IT infrastructure. A UPS also gives critical systems enough time to gracefully shut down and switch off before the UPS batteries are exhausted. If possible an email message can be sent to the outside world before everything goes dark.
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