Disk Space Warning
You may receive a warning that your project is running out of disk space. Here are a few options to consider if the project’s storage disk is full. As noted in Backups, project snapshot storage does not count against your disk space quota.
Store less data, delete what you don’t need.
Work with more than one project.
Buy an upgrade for additional disk space.
Connect to a remote file storage.
If the problem is with a Jupyter notebook using too much disk space, click on Servers in the Activity Bar, then “JupyterLab server”, then open your file from there, and remove extra content to make the size smaller, then save it. After that you may be able to open it in Cocalc again.