There's a way for you to have some of the files locally stored:
- You should download and install the Repostitory Browser and save all files locally
- When editing a script, a local file gets saved (I believe somewhere in the AppData folder, if I am not mistaken) -> Information is somewhere on the forums here
The whole setup of a SaaS as HeroCloud is exactly not having the files locally but stored safely in a cloud, where backups are made.