Just use git. It’s what all these front ends use at their core. It’s all just git which doesn’t need any hosting at all. If all you want is tracking changes you don’t even need to set up a remote to push / pull from. Just install git on your local development machine, make a folder for you project, and run ‘git init’. Now you have a local repo which can track and commit changes and you have all of the incredibly powerful tools available that git provides with ample documentation. Wanna back it up? Just backup the folder with any standard backup application like any other folder.