I learned my lesson when Microsoft OneNote, upon having my notebooks full and my storage cap hit, did not even allow me to delete anything, because I could not save due to "storage full". However, it was also impossible to export OneNote locally because the newer apps only work with the cloud. I had to download an older version to download my files, delete some notebooks, and go back under the storage cap.

Or I could have paid Microsoft. But I did not feel like it.