Is it possible to copy a Trello board, keep all the columns and cards, but loose all the card contents (eg. comments, descriptions, checklists etc..)
You can turn the board into template.
Creating templates from boards Boards of all visibilities within Business Class and Enterprise teams can be turned into templates. Additionally, any public board--whether personal or part of a team--can be converted to a template.
- From the Board Menu, select More and then select Make Template. (You must be an admin of the board to see this option.) Turning the board into a template will hide comments and activity, but members will remain on the template.
https://help.trello.com/article/1187-creating-template-boards