Creates a new DB instance that acts as a read replica for an existing source DB instance or Multi-AZ DB cluster. You can create a read replica for a DB instance running MySQL, MariaDB, Oracle, PostgreSQL, or SQL Server. You can create a read replica for a Multi-AZ DB cluster running MySQL or PostgreSQL. For more information, see Working with read replicas and Migrating from a Multi-AZ DB cluster to a DB instance using a read replica in the Amazon RDS User Guide.

Amazon Aurora doesn't support this operation. Call the CreateDBInstance operation to create a DB instance for an Aurora DB cluster.

All read replica DB instances are created with backups disabled. All other attributes (including DB security groups and DB parameter groups) are inherited from the source DB instance or cluster, except as specified.

Your source DB instance or cluster must have backup retention enabled.