To export notes click with right mouse button on program icon in system notification area and choose "Backup/Synchronization"-->"Export All Notes" menu item from context menu. There are five available formats for export: PDF file, TIF image, DOC document, RTF document and TXT file.
Also you can change your report look by choosing "Configure report" menu item under "Export All Notes".
As you can see, note's name and text are mandatory fields, while others are optional.
By default report will include all notes, but you may decrease it by choosing dates scope.
If "Show flags" check box is selected, then each note's data in report will include information about various flags (whether note is in Favorites, marked as completed, has high priority etc)
Export can be also made from command line.