mysqldump -u root -p wiki1db > wiki1db.sql
tar -cvzf wiki1.tgz /var/www/wikis/wiki1


New server:
mysql -u root -p -h localhost
create database wiki1db;
grant create, select, insert, update, delete, lock tables on wiki1db.* to wikiuser@localhost identified by 'Password' ;

copy files over to new folder
run php update.php from maintenance folder after updating adminsettings.php

(see also localsettings.php)