Is it possible to save code that works (compiles, runs, does what you want) in Xcode to be able to add new features and not be worried about breaking the code to the point of no return?
Xcode Testing Help
It sounds like you want an SCM system. I suggest GitHub.
So I would upload my code to Github then? I would be able to overwrite any changes I've made in Xcode with the files I've uploaded to Github?