Why do people always forget the 'cloud' is just someone else's computer.
Nothing important should ever exist solely on the 'cloud'.
I wouldn't even trust a backup copy sent to email, yet I see that constantly as well.
https://news.ycombinator.com/item?id=31652650 ("I've locked myself out of my digital life")
The article you referenced was getting locked out of accounts. We are speaking of having documents backed up, not google accounts.
The best way period would be to periodically backup to an external HD or even SD cards.
People need to get over this cloud bullshit years ago.
All of these problems have been solved since the advent of the internet, these are all self-imposed problems.
and where do you store those?
you really want multiple backups, and an encrypted cloud storage is one of them.