Databases
RDS has two features.
- Multi AZ for disaster recovery. Consist primary and secondary databases
- Read Replicas for performance. Consist primary and read replica
Read replicas can be helpful in creating reports every day without touching primary databases.
Automated Backups
enabled by default, The data is stored in s3 and you get free storage space equal to the size of your database. So , if you have RDS instance of 10 gb, you will get 10Gb worth of storage. Backups are taken within defined window. During the backup window, storage I/O may be suspended while your data is being backed up and you may experience elevated latency.