RDS DR may fail with the error "Option group whateveroptiongroupgoeshere does not exist."
RDS DR may fail with the following error printed in the log:
Fri 04/26/2019 09:34:52 AM - Error - RDS DR copy snapshot failed for region Anyregion (region), snapshot cpm-policy-40-db7-2019-4-26-12-30. Reason: Option group whateveroptiongroupgoeshere does not exist.
When performing DR for RDS, you must ensure that the target region/account has the same target option group(s) as the source region/account. Correcting this will fix this error.