Do you save the steps of your drawings?

Just being curious...

you know, when I draw, I'm afraid I might do a big mistake that could ruin the whole drawing... so I save every important step on my computer: sketching, inking, coloring of the characters, then finally the finished work... so, just in case something goes wrong, I can use theses saves as back-ups ... I don't need to start all over again...

am I the only weirdo who does that??? and how do you deal with the fear of screwing things up when you go forward??