Note that this functionality is only available in the web version of Studio.
If you ever need to save the contents of your project without pushing to a Git repository, you can download a zip file of the current project directly from the Studio settings menu.
To download a project:
If you haven't already, select the project you would like to download from the Studio landing screen
Navigate to the settings menu using the cog wheel at the left bottom corner of the screen
Select the Project Settings option from the menu
Click the Download Project button, which will start the download
This functionality was added with v1.1.0 of Stoplight Studio.