Steps

Small tutorial how to move from one location to another location LHC instance.

• Dump/Export database. For example form phpmyadmin or any other database tool.
• Transfer chat folder from old location to new location.
• Import database to new server
• Disable cache

'templatecache' => false,
'templatecompile' => false,
'modulecompile' => false

• Update database settings in settings/settings.ini.php file

'db' =>
    array (
      'host' => '<host>',
      'user' => '<username>',
      'password' => '<password>,
      'database' => '<database>'

• Make sure cache folder is writable
• Clear cache in back offce
• Enable caching by setting previous values to true

Should I export table lh_chat_online_user footprint as well?

No it's not necessarily. It will fill up again just you won't have users browsing path.