Do you happen to know when the last time was that a rich company was prosecuted for this?
It seems a lot like the perjury laws: there to scare poor people into telling the truth because of almost non-existant prosecution of it.
And if it is a fine and not jail time (white collar crimes are almost never jail time) the fine would have to be much larger than the penalties they would not have to pay because of the crime, otherwise it is simply a net win for the company
The shed as an of site backup is a good idea.
We live in the shed (it is really its own entire stone building) during our full house renovation, so I have already run electrical and cat6a to the shed and have an old router in AP mode there.
Hooking up one of those NAS boards or a 2nd hand old PC there would be a good backup option.