Exporting Notes for Contacts Resulting in Incomplete Notes
You should be able to do so by using API directly. cf. https://yourdomain.org/civicrm/api/explorer and use Entity = Note and Action = get

If you want to have it in a csv format, you could use the command line script provided in CiviCRM bin/csv/export.php

You will find the information about this script here : https://civicrm.org/blog/xavier/new-tools-to-automate-the-configuration-and-stagingproduction-migration

So you should be able to do what you want we a command line like :

php /full/path/to/bin/csv/export.php -u"user" -p"password" -s"yourdomain.org" Note &gt; notes.csv