Thank you so much for a detailed answer. I think I understand what you are saying. Other than installing buddypress, extra plugins and a theme we have not done any extra customisations to the functions.php.
So if i delete the buddypress plugin and the other plugins and the theme, I would get a quite clean start right?
If I do so. Is there any special steps I need to take on when installing buddypress and other plugins again to make sure the users info shos up again or does that automatically happen?