Is it normal to use snapshots to fix mistakes?

I've never actually fixed my computer. I just use snapshots whenever I think I'm about to break something so if something does break I just roll back to before I made my mistake and try again. Disk space is basically free these days so it is feasible to store a lot of snapshots of my computer. How did people live before we had huge cheap disks that enable us to basically use time travel to fix all of our mistakes?