TFS Back-up Notifications
I believe your primary issue is that you have this group of users in the [Team Foundation]\Team Foundation Administrators group or possibly many users added with privileges to the Administration Console Users, which is unusual.  To adjust who is part of the Team Foundation Administrators group:


RDP to the server that hosts the application tier for your TFS installation
Open the TFS Administration Console
Highlight the Application Tier
Click the Group Membership link
Double-click [Team Foundation]\Team Foundation Administrators
Adjust membership of the group


To learn more about configuring administrators from the TFS Administration console, see Microsoft's documentation on the topic.