I'm setting up a Mac Mini Server for the first time, and can not seem to find a good explanation of what exactly the "System Group" is or does. in context: When I create a new share point for file sharing, and go into edit the share point settings, I see: 1. my user account w/ read and write access (owner) 2. Spotlight w/ custom access 3. 'System Group (primary group)' with read-only access 4. Everybody else The System Group bothers me in that I don't have a good understanding of what all comprises that group? Is it a special access for system processes to be able to see the files, such as making the files accessible to Time Machine other system process? What are the risks of leaving the System Group with read only access -or- conversely, what are implications of giving System Group no access to a share point? The machine is going to be file share and wiki server for a small workgroup, but there will be certain shares with confidential information I would like to ensure remains restricted to authorized users only. Thanks!