in the quiz for chapter 4, there is a question asking "In the AWS shared responsibility model, what is AWS not responsible for?", and I chose Amazon Relational Database Service (RDS) database backups because you are responsible for backing up your databases, however, the answer was incorrect, the correct answer was Setting permissions for objects stored in Amazon S3, so why my answer was wrong and why this answer was correct?
RDS is managed service. AWS manage everything including backups. While creating RDS you can select backup frequency. That’s why your answer is wrong. For more you can refer AWS Documentation.
And S3 object permission is users responsibility. As you have manage bucket and object level permission for each bucket.
Hope this help.
You are responsible for backing up your databases running on EC2. RDS is a fully-managed service, so the customer is only responsible for their own data in this scenario.