Network managers in the least should know most if not all of the default configurations of whatever respective databases they are working with.
If not, it is useful to have a .conf.bak of all the necessary config files on your server either in full (redacted or encrypted backups) or partial/commented out code. Usually there are useful organizational directions or references (see ircd.conf and httpd.conf for examples).
Another place one might find bare minimum copies of default linux configs is in /etc/default but most if not all configs are usually found in a simple Google search for the name.