Only the owner of the public board who created it is going to be able to export the board but in order to do that you need to be a paid user of EasyRetro.
If you're not a paid user yet, click here to check out our plans!
If you’re a team owner you can export your team board at any time.
If you assigned admins for your team, they also can export a team board.
If a team member creates a team board, they’ll be able to export a team board as well.
Click here to learn how to export a board.