Plus, even if you manage to never, ever have a drive fail, accidentally delete something that you wanted to keep, inadvertently screw up a filesystem, crash into a corruption bug, have malware destroy stuff, make an error in writing it a script causing it to wipe data, just realize that an old version of something you overwrote was still something you wanted, or run into any of the other ways in which you could lose data…
You gain the peace of mind of knowing that your data isn’t a single point of failure away from being gone. I remember some pucker-inducing moments before I ran backups. Even aside from not losing data on a number of occasions, I could sleep a lot more comfortably on the times that weren’t those occasions.
The problem is that that guy created what is probably the biggest, most timeless simple video game in history. Your chances of repeating that are really low.
It’s like you discover fire at 21. The chances of doing it again? Not high. You could maybe do other successful things, but it’d be nearly impossible to do something as big again.