Have you ever wondering when you've completed designing a single mission then you accidentally save the current to the previous one? Well to be honest, This is one of the most annoying and frustrating moment that the designers can do when saving missions and its an irreversible method, mostly the cause here is the lag when we are navigating the DYOM menu. But there's a way to prevent this from happening which is why I've provide a tutorial on how we designers avoid this.

GUIDE #1
First of all, create a folder anywhere and rename the folder on anything you want. Now then, If you have finished mission you've designed and want to design another one? You must back-up the finished mission by copy-paste it to the folder you've created and that's it! You're done. This way you don't have to worry about the finished mission when you accidentally save the current one because you've made a backup so you can retrieve it back as many times.
That's all! Thank you and have fun.