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If your goal is to game or work during a power outage, sure.

If your goal is just to protect your data from sudden termination, then having a PSU with a built in UPS is quite nice.

Being able to power any external device (like a hard drive) or to be able to cleanly exit from whatever you're working on if you happen to be present (with a monitor) are both pursuant to these goals.

The average PC or workstation isn't configured for a clean exit just because the UPS said it's time.

Bridging momentary outages is also useful where that's common, disregarding data loss.

They ought to be able to exit cleanly in time... that's what hibernation is for.

What they are saying is that in the case with their setup they can't trigger shutdown or hibernation without a backed up KVM.

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