Quite easyOn the existing installation perform a
or use similar in phpmyadmin.
mysqldump -u tikiuser -p tiki-db > dump.sql
On the new run
or similar in phpMyaadmin
mysql -u tikiuser -p tiki-db < dump.sql
Now, you will need to copy over any file, image, and forum directories that are setup, also copy over img/wiki_up , games?, custom themes in styles/ and templates/styles/ to the new installation.
That should be it then