pdf-file notes, are they stored separately?

As I have understood it there are two ways (at least) to write notes in Zotero.
a) To add a separate note (straight forward enough)
b) For pdf-files you can write in the field located below the specific file-information (in the pane to the right in the standard window set up). Those notes does not appear as a separate note, but are available if you mark the pdf-file.

I wonder about the last case. Are those pdf-notes stored in the zotero.sqlite-file, so that they are backed up if I make a copy of this file? Or are they somehow stored in the pdf-file so that I have to backup the pdf in order to back up the note?
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