When setting up CloudTrail, you must specific a S3 bucket to store the data in.
Since I'm using CloudWatch (and CloudWatch metrics/alarms) for storage, I do not believe that I also need to store the data redundantly in S3.
Is there a reason even after configuring CloudWatch for CloudTrail, that I must also keep using S3 storage? Is there a way to turn off S3 storage for CloudTrail?