I'm an EU citizen and was not aware of this "demand for data" thing. What does physical copy mean? Are they going to send me 20 boxes full of papers?
The maximum they can charge is set in law and is about €5.
More details for Facebook here: http://europe-v-facebook.org/EN/Get_your_Data_/get_your_data...
I believe in Germany you can have someone send all your private data once a year in physical copy and you only need to pay for undue transport costs.