The issue is space. There are many sites/services that will let you store your data for free, such as GitHub. Listen, I came back to FCC after a few months myself. The Beta had expired. I redid pretty much the entire curriculum despite having saved copies of my earlier code. The challenges flew by, and my new solutions to the more challenging algorithm problems were far superior. I understand what you mean about tracking growth, but to know whether data has changed, you have to save the data first.