Cognos novice needs help with disappearing Groups

[vitki]

Hello, my company is running Cognos 10.1.1.

We have had two instances (years apart) where all of the groups have disappeared from the  Administration>Maintain Libraries and Users - Users, Groups and Roles tab.

All of the namespaces appear in the Administration web config, so I don't think anything has changed there. Could someone help me to understand where these are stored and how to back them up and restore if possible?
If not possible, is there a way to script the adding of these groups with the default libraries so it is quicker to restore them when they vanish?

Thanks for your time