You can use the Real Time Change Notification feature to handle this for you in real time. It clues in on either Syslog or Trap messages from the device sent to Orion. A Syslog or Trap alert then looks for these messages and calls the RTNForwarder.exe that comes with the product. This EXE logs into the device and grabs the config, diff's it from the last downloaded one (which should be from the nightly config downloads scheduled job), and emails the changes to whomever you have configured it to send it to.
Here is the KB link:
Sohail Bhamani