Claude deleted a law professor's year of lecture notes, and Dropbox brought them back

What happened

William Baude, a law professor at the University of Chicago, posted on X on November 5 that Claude had deleted a year of his constitutional law lecture notes and his current syllabus while he was at lunch. As FourWeekMBA reported, the task he had given the assistant was updating page numbers in an old set of lecture notes.

That is an editing job. Nothing about it calls for removing files, which is a large part of why the post spread. By November 7 it had about 2.0 million views.

The story ends well. Baude wrote in a reply, as quoted by Dexerto, "I did recover them all, thanks to Dropbox." He said he was posting anyway as a public service announcement.

What the screenshot shows

Baude attached a screenshot of the assistant's messages. In it, the assistant admits it deleted his Fall 2026 final syllabus and all the top-level notes files for his 2023 classes by accident, and says they had not been restored.

The same message says the page check itself turned up one wrong citation, off by a single page, and that the assistant had not edited the notes. It then asked whether Baude could restore the files from Dropbox, or whether it should try again from a browser pane, meaning a built-in web view inside the tool.

Baude answered with an angry reply. The assistant apologized, blamed its own carelessness, and said it was trying the Dropbox restore page again. It promised not to click Restore or change anything without telling him first.

Where the safety net came from

Notice who did the rescuing. The assistant did not undo its own mistake. The recovery came from Dropbox, an online storage service that keeps a history of file changes, so deleted files can be brought back.

That is the practical point of the story. The assistant had enough access to delete a syllabus and a year of notes, and the only reason the loss was temporary is that a separate system held earlier versions of those files.

What we do not know

Much is missing. Baude's post does not say which Claude product or model he used, and Dexerto's report says the same. The screenshot mentions a browser pane and the Dropbox restore page but gives no product name.

We also do not know what caused the deletion beyond the assistant's own message, or whether any approval prompt appeared on screen. The reports we read include no comment from Anthropic, Claude's maker. The account rests on Baude's post and screenshot, and the files and the full session have not been seen.

What Anthropic already advises

Anthropic has a help page for Cowork, its agent that works inside folders a user connects. The page says Cowork needs explicit permission before permanently deleting files, and that users must choose "Allow" before a deletion can go ahead. It does not discuss Baude's case, and his post does not say he used Cowork.

The same page gives general advice that fits this story well. Create a dedicated working folder for Claude instead of granting broad access, and keep backups of important files.

• Narrow access: give the AI one folder, not your whole drive.
• A copy it cannot touch: keep backups or file history somewhere the tool has no control over.

The lesson beyond one professor

Chat tools that only answer questions cannot harm your files. The risk begins when you connect an assistant, often called an agent because it takes actions rather than just replying, to your documents.

Most people do not need to stop using such tools. They need one habit: before an AI edits something hard to recreate, make sure a second copy exists. A price sheet, a customer list, a résumé, a script and a syllabus all qualify.

Baude's near miss cost him an afternoon's worry rather than a year of work. That is the whole value of a backup.