Facebook has a function download all the data they have about you: https://www.facebook.com/help/405183566203254

Unfortunately this one is broken for months and Facebook doesn't reply / help.

Error Message: We're sorry. Something went wrong and we weren't able to put together a copy of your Facebook data. Please start the process again by visiting your account settings and clicking "Download a copy of your Facebook data."

Could you please upvote this privacy feature, to finally give Facebook Devs a hint?