The best way to get your list out of To Do is either by printing it, or emailing it. You can do this by tapping or clicking the list name, then Settings > Actions.
You can export your lists and folders as CSV, JSON and PDF files. To get a more detailed guide click here.
If you're able to, another option would be to use the API directly or export as CSV or PDF via the API. You can find our API documentation here: https://zenkit.com/docs/api