In reply to ThompsonPaul.

Thanks for the suggestion!
Not sure if it's what I was thinking but I'll give it a try!
I suppose you have to login to WP to access it? My idea was when your site crashes with an auto-update and you can't access the dashboard. I'm not sure if this still happens but you get the idea.
In this case, you would receive an email with a quick link warning you to restore it.
And it just came to my mind we could chose the preferable hour for auto-updates just for less impact on site downtime.