Zip file of the raw SQL data from the old PHPBB forums is about 450KiB.
BPFK data from the old TWiki, as zip of text files is about 38KiB.
-Robin
This query extracts posted text chronologically from the PHPBB database:
select t.topic_title, pt.post_subject, u.username, from_unixtime(p.post_time) as post_time, pt.post_text from phpbb_posts p join phpbb_posts_text pt on pt.post_id = p.post_id join phpbb_users u on p.poster_id = u.user_id join phpbb_topics t on t.topic_id = p.topic_id order by p.post_time \G