If you need to get a backup of the D-RATS configuration you can copy out all the contents of the configuration file directory. It also has all your custom forms, mail etc.

The d-rats.config is the main configuration file for the D-RATS program.
The repeater.config is the main configuration file for the D-RATS repeater or called ratflector.

Windows v7, v8, 8.1

C:\Users\%username%\AppData\Roaming\D-RATS
%username% will take the default username you are signed in with or you can type in your user profile name listed under c:\users\?

Linux

/home/*yourusername*/.d-rats#
“.d-rats” is a hidden a folder in your home directory.

On PI with pi user it is /home/pi/.d-rats#