Automated Backups allow you to recover your database to any point in time within a retention period. The retention period can be between 1 – 35 days. Automated backups will take a full daily snapshot and will store transaction logs throughout the day. This allows you to do a point in time recovery down to a second, within the retention period.
Automated backups are enabled by default. The backup data is stored in S3 and your tree storage space is equal to the size of the database.
A DB snapshot is initiated manually and is stored even after you delete the original RDS instance, unlike automated backups.