When a user is no longer in the User Profile Database, the My Site Cleanup Job tries to assign ownership of that user's My ...

When a user is no longer in the User Profile Database, the My Site Cleanup Job tries to assign ownership of that user's My Site to the user's manager. If the user does not have a manager, ownership of that user's My Site is assigned to the Secondary My Site Owner.
The My Site in question gets deleted two weeks after this reassignment of ownership. This gives the manager or the Secondary My Site Owner an opportunity to retrieve content from the My Site before its deletion.
Specify the user account you want to use as Secondary My Site Owner.