Did you ever scream your lungs out in pain after mangling your work?
Did you back up your manglings? Did you back up your manglings over your last good version of your program? Or did you role something into production and find the error later and need to know what change blew things up? You’re not alone.
Version Control to the Rescue! What’s version control? It’s a better way of backing up your changes to a file or several files.