Does iMac shutdown nicely on power failure?

I have heard that the iMac 5K 2014 shuts down automatically on detecting mains power fluctuation. Great if this shuts down the 128GB SSD in an orderly fashion. If not I may have to get a UPS, though one I can afford could be unreliable! How paranoid should I be about this?
I do have Time Machine on. Loss of my unsaved data is an acceptable risk, and not what I am concerned about here: I am worried about maintaining iMac system integrity.
So, can someone please enlighten me about automatic shutdown of the iMac?

Tim Durbridge wrote:
That's reassuring.
But does the iMac shut down automatically on power failure?
Does that protect the system well enough for practical purposes?
Would that be why you operate a computer without a UPS?
The iMac does not have an internal battery or UPS. It will NOT shut down automatically or otherwise when power is lost. If you lose the mains the computer immediately stops working and serious corruption can and has indeed happened. Think about what you said. You lose main power to the machine. It has no power of its own, no internal reserve supply (and I know of no personal computer that does). It may or may not recover when power is restored and it depends on what was going on at the time the power failed.
If data loss or corruption is is unacceptable then a UPS is a must have. A UPS will allow the machine to shut down properly. OS X has built-in UPS power management software. You can set the computer to properly shut down when the UPS reaches say 20% reserve power.
Buy the best UPS you can possibly afford.

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Welcome to Apple Support Communities
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iRocket wrote:
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Message was edited by: cavenewt

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Does iMac shutdown nicely on power failure?

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