Ditch USBs and start using real version control, and if you follow this guide, you can start using git in 30 minutes!
If you have any experience with programming or just altering config files, I'm sure you've been dumbstruck by how one change you've made along the line affects the whole project. Identifying and isolating the problem without a version control system is often time- and energy-intensive, involving retracing your steps and checking all changes made before the unwanted behavior first occurred. A version control system is designed explicitly to make that process easier and provide readable comparisons between versions of text.
