Hi @Philippe Glorieux when copying a board it does not copy the members or the activity of the board. If you copy the cards individually and then move those cards to the new board you can keep the comments. When copying a card and it will then give you the option to include comments in the new card. You may consider submitting this to Trello as a feature request to have the option to include comments when copying the full board. Here is a link:
If you had to thrive a new habit during a lockdown, what would it be? Trello
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event