You may find that for large updates, you wish to export all your product data, make changes in a spreadsheet, and then import it. We provide a saved export in the back end (DB admin, exports section) for this, which has been updated in v2.9005 to match the format the data tool requires for import.

The images fields will be output as blank; you can run in data without these and it won't wipe images, as the images are stored in the 'Images' folder on the site, and the data tool will only update the database content.