Primary tables filter

Hello,

I haven′t installed the plugin yet. I′m reading the FAQ′s and don′t understand what this filter does:

WARNING : If you clone the primary site, you must use mucd_default_primary_tables_to_copy filter to declare plugins and custom database tables, or your cloned site won’t be complete.

I′d like to get an exact clone of my primary site, and after that, future changes in the cloned site will be done manually and will have the exact same content/functionality as the primary site. Should I need to add that filter?

Regards,

Julia