http://documentation.magnolia-cms.com/display/DOCS45/Template+definitions#Templatedefinitions-Autogeneratedcomponents

CopyGenerator:

• doesn't allow removing of Autogenerated components (When you remove component from the page then the component is automatically recreated and is ordered as last)
• during first generation components are ordered as in template definition
• allow reorder components at the page
• if components were already created and you add new component into template definition then the new component will be automatically generated and ordered as last