Let me route you to the right support to resolve the cData exporting issue, @nbarston.
To get assistance with your concern, you can contact cData's support team. They have the necessary tools and resources to identify the root cause of the problem. Please note that the data downloaded in QuickBooks Desktop (QBDT) depends on what the third-party app shares with us.
Additionally, here's an article you can use as a guide when importing and exporting information with QBDT: Import and export data in QuickBooks Desktop.
Just in case you need to transfer lists from an old company file to a new one, you can check out this article for further help: Export lists from the old company file into a new data file.
If there's anything else I can help you with besides exporting data to QBDT with cData, feel free to add a reply below. I'll be there to assist you. Stay safe!
