A nice overview <https://www.stuff.co.nz/national/115118698/how-the-national-library-preserves-new-zealands-digital-heritage> of what it means to preserve historical documents in the digital online age. What happens when the legal obligations of the National Library collide with the terms and conditions of overseas-run sites hosting content posted by New Zealanders? How do you deal with private/defamatory/pornographic material? Proprietary file formats? Some people are even donating their e-mail archives to the Library.