To move your Joomla site from either one directory to another or between servers, you need to follow these steps:

• Copy over your files, (use ftp or SSH/command line if you have access)
  
• Backup and then restore your database  - perhaps using phpmyadmin or SSH/command line (this step only needed if moving site from one server to another.)
• Edit your configuration.php file to reflect the new values. Specifically the following:
  

 $mosConfig_user = 'joomla_joomla';
 $mosConfig_password = 'password';
 $mosConfig_db = 'joomla_joomla';
 $mosConfig_absolute_path = '/home/joomla/public_html';
 $mosConfig_live_site = 'http://www.joomla.org';
 $mosConfig_cachepath = '/your absolute path/cache';