@testbug
I am not an IT guy but I think when you clone the machine and use it as a test environment to install an update, you can't simulate the users activities so you maybe can't be sure how it goes when it's in live..
What I am worried about is the maintenance page. The page is so ugly and unprofessional, why as a supposed serious company don't you install at least a more friendly maintenance page....
And then come to my mind: why do you want a more friendly page when everyone left the office and are not planning on coming back