One in three
I'm willing to bet that all of them
1) have no technical understanding of what they're using
2) are incapable of making a backup if their life depended on it, and
3) will still not learn the importance of backups if it does happen to them
That is the price to pay when computing has been commoditized. That thing that is grafted to your hand is a computer. Learn how it works beyond just flicking screens from right to left.