no need to fire up the old PC every now and then - I mean you can if you wanted to, or you could keep it 'fresh' if you thought you would need to use it regularly.SSD drives do not need to be defragged. I need to check if yours is an ssd - should be.
Firefox Click on me
Have a read of this
Not really lets get another opinion
@Bruce
but it'll catch itself up when you do turn it on the next time.
in other words, do you run it regularly and have it spend 5 minutes doing updates, or run it once every blue moon and let it spend 30 minutes doing updates.
personally, I'd be leaving it alone until the day you need to use it.