macos - Where does OS X Mountain Lion store Notes data?

Any idea about where OS X Mountain Lion stores Notes data? Is there a way that I can recover lost Notes?

Answer

Notes are stored as HTML in an apparently non-standard binary format in ~/Library/Containers/com.apple.Notes/Data/Library/Notes/NotesV1.storedata-wal.

You can grep for known note contents on the command line, or print all notes (stored as HTML):

cat ~/Library/Containers/com.apple.Notes/Data/Library/Notes/NotesV1.storedata-wal | grep -aio '.*'

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While I was writing this answer, I also had the problem once that Notes restarted with data reset. The next launch, everything was there again, even though I had created new notes after the reset (so both the old and new notes existed on third launch). Maybe just try quitting and starting Notes again?