This I can agree with, we also have some glorious electrical storms here on the NE Florida coast, very nice to watch the sky but not so much fun when its overhead instead of out at sea.
Now on my third UPS but thats cheap compared to possible costs and aggro beyond that UPS if not there.
You may find this helpful
I switch all my gear off completely
Then I start it all an hour or more before I sit down for a good listen 
Maybe I am missing a point somewhere, but if you have millions of volts zapping down a telephone wire and into your (wired) network, then it wonât make much difference whether it is switched on or off, will it ?
Unplugged and disconnected I can see, but merely powered down ? Curious to know what others may think about that.
zappyroon I think you are absolutely correct. A direct hit will take out just about anything and even blow holes in concrete. But, it doesnât take a direct hit to fry electronics. Most of the time its a current surge that can and does follow the easiest available route. I do not live in a bad lightning area but installed a whole house surge protector. Electrician was explicit that it will not stop a direct hit. Cheap insurance at about $350. YMMV.
Regards,
Paul
Yeah, to add to the paranoia, a whole house suppressor wonât stop surges that occur because of a faulty device on the house circuit.
The wired network within the house is fine , the fibre connection is underground just until it enters the house so also fine. Also fibre doesnât strictly conduct but at the voltages involved even non-conducting materials may transmit high voltage static.
My disaster was exactly as you say, I was powered down and unplugged from the mains but the ADSL, copper phone line was still connected . It literally blew the ADSL filter to shreds. This all happened within days of setting up a wired network in the house - âFateâ
There are too many examples of lightening strikes travelling as spikes down the mains wiring often miles away from the house . So unplugging is a must . A UPS may work as a sacrificial electronic device but its an expensive âfuseâ. A friend had a bad experience of a mains strike that took out âwhite appliancesâ , fridge, freezer, dishwasher etc. All basically electronic these days le alone hi fi and TVâs etc.
So the answer is unplug from mains and disconnect any phone lines. This was my practice after the disaster until I converted to fibre. Now I just unplug the mains.
I may seem paranoid but in our summer we get a lightening storm virtually every day. They vary in intensity but some are really heavy. My neighbours tree catching fire by a strike isnât common but it happened.
Fortunately being a common occurrence, the insurance companies are well set up to handle such claims. My kit was all replaced like for like.
Has anyone from Roon commented on whether to turn the Nucleus off when finished with it for the day?
we do not suggest you turn it off⌠its not terrible if you do, but it likes to do things in the background (like update metadata) and itâs nice when that happens at night
Mine has been running for over 2 1/2 years.
My NUC / ROCK is powered down daily, currently 3 times daily due to load shedding.
I followed @danny advice and use the power button short press. I have been doing this for several months with no ill effects.
Oh how I would love to leave stuff running , but that needs power 
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I leave everything running here always. The Nucleus/Nucleus+ does not consume that much power, turn of the lights when leaving a room will have bigger effect.
In my opinion, itâs always a good idea to keep your Roon server online 24 seven as itâs very efficient and doesnât use very much power
If you live in the US, it seems, no⌠if you live everywhere else, youâll probably want to turn it off!
There arenât millions of volts sapping down on your server, just electric pulses in the case of your land and if you have a fiber front in just light pulses, not millions of volts just a few volts less than one at idle no more than 3 volts
Fiber cables cannot conduct electricity, since theyâre made out of non-conductive material they only transmit light, pulses, not current