I have a feeling that the unnamed todo service is Todoist. They offer a free plan, but backing up data requires a Pro plan which is really not ideal:

https://todoist.com/help/articles/backups

I use the free plan, don’t reside in Europe, and recently wanted a backup. If you’re in the same boat, I recommend the following project — it has good documentation and immediately worked.

https://github.com/darekkay/todoist-export