For our project at FHNW (see Talk „FHNW CMS Upgrade Project“) we migrated 130k objects from Plone 5.2 with Mosaic to Plone 6.0 with Volto 18. We used collective.exportimport and extended it so Mosaic widgets became Volto blocks during the migration. In this talk we present interesting technical details as well as general topics related to the migration.