You can export listings that using the listings exporter tool. You can only export one type of listing at a time (this is because different listing types will have a different set of fields).

To export listings, select the Export Listings tab from the Setup tab in the listings module. You will then be required to select the type of listings you wish to export. Once chosen, you can then decide which fields you want to export and the order in which they will appear.

Once you have chosen the fields you will be sent a CSV file containing all the exported listings. The listings will be exported in a format that is also compatible with the listing importer (including files and categories).