
I'd import anything possible without attachments. You will only have missing attachments but you can keep your forum on read mode so you or your moderators can recover attachments as they are requested.
I recently lost all files from one board, but having content with broken attachments (which aren't all necessary anymore) is better than having no content.
I recently lost all files from one board, but having content with broken attachments (which aren't all necessary anymore) is better than having no content.