1. How to copy a project?
You need to have administrative privileges or to be a Project Manager of a project to be able to copy a project.
1.1 To copy a project -> go to the Dashboard and click on the Project Settings icon (the dotted menu that belongs to every project name) -> select "Copy Project".
1.2 A new panel opens up -> choose which information to be copied to the new project e.g. the boards; the boards members; all the tasks (you have the option to move them in the backlog) and you can preserve their types/assignees/custom fields. You may choose whether to preserve the links. The panel also allows you to copy: card types and templates.
Once you make your choice -> click on the "Copy Project" button.