In Amazon RDS for SQL Server, configure the native backup and restore option and assign the permissions policy to the IAM role. And, if you don't want to use the master account, create a non-master account.
Before You Begin
Review the limitations provided by AWS for integrating AWS RDS for SQL server DB instance with Amazon S3.
Procedure
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If you don't want to use the master account to back up the Amazon RDS for SQL Server instance, create a non-master account.