For a website that has been administered by Contribute (Publishing server is not enabled), you would find an _mm folder in the website root on the remove server. This is a contribute specific folder and it contains the administrative settings, role information and users.
For CPS managed sites, the _mm folder still holds the information about the administrative settings and role information. The user information of the sites are stored in the Database folder of CPS. The Database folder can be found in the following location, <CPS Install Path>\Database.