For whatever it is worth:
This is not a statement about AppStudio but about development in general:
It’s a very good idea to come up with your own convenient way of frequently taking a copy of your project folder and saving. Regardless of the development tool I am using, I do this all the time. Literally at least every hour while developing. I copy the whole folder, and I give it a unique name by using the date and time in the folder name. Then, whenever I need to walk Backwards, I can just flip back to a previous folder.
There are many ways to achieve it, but however you do it, it is a good idea to get in that habit.