In theory should be pretty simple: copy all files (exclude data directory) and using phpmyadmin backup database structure (settings table you probably want make full backup), and finally add two users with this database query (again via phpmyadmin)
INSERT INTO 4images_users VALUES (-1, -1, 'Guest', '0493984f537120be0b8d96bc9b69cdd2', '', 0, 0, 0, 0, '', 0, '', 0, 0, '', '');
INSERT INTO 4images_users VALUES (1, 9, 'admin', '21232f297a57a5a743894a0e4a801fc3', 'admin@yourdomain.com', 1, 1, 0, 1016023608, '1e3457c0b2052a9633b886fd75ef91e0', 1016023608, '', 0, 0, '', '');
login with username/pass: admin/admin