It's been a while since I added new features to my note-keeping Papercuts extension for Chrome, but I've just pushed a new version 3.2 to add Note Exporting from the Options page.
There's a few caveats to be aware of - exporting will save notes in a raw JSON file format so you'll probably want to use a tool such as JSON viewer to read it. None of the metadata needed by Papercuts is saved, so there is no way to re-import notes - this feature may be added at a later date but I have no planned timeline currently.
Something that many users might not realize is that as Papercuts are saved as bookmark data, you can always export your bookmarks from Chrome and re-import them exactly as they were. This is still the recommended way of backing up Papercuts, but I hope the new Export feature proves useful for transferring notes to other services or just as peace of mind that they won't get lost if you lose your Chrome data.
Papercuts 3.2 also contains some polish to the settings/help pages and a jQuery update for potential performance improvements.
