If running controller version 7.93 and above, there is a feature to take backup of cfg files automatically.
1. Apply robot_update v7.93 to the robot(s)
2. Add the following in robot.cfg. audit = 5
3. Restart the robot
NOTE: When you make change on some probe cfg, it will create a backup copy of probe cfg before changing.
The backup files can be found in the /robot/cfgs/* And you can check the brief details of change including the user in controller_audit.txt under /robot/ folder.