By default, Amazon RDS creates and saves automated backups of your DB instance securely in Amazon S3 for a user-specified retention period. In addition, you can create snapshots, which are user-initiated backups of your instance that are kept until you explicitly delete them.

You can create a new instance from a database snapshots whenever you desire. Although database snapshots serve operationally as full backups, you are billed only for incremental storage use.

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Turned on by default, the automated backup feature of Amazon RDS will backup your databases and transaction logs. Amazon RDS automatically creates a storage volume snapshot of your DB instance, backing up the entire DB instance and not just individual databases.  

This backup occurs during a daily user-configurable 30 minute period known as the backup window. Automated backups are kept for a configurable number of days (called the backup retention period). Your automatic backup retention period can be configured to up to thirty-five days.

You can restore your DB instance to any specific time during the backup retention period, creating a new DB instance. To restore your database instance, you can use the AWS Console or Command Line Interface.

To determine the latest restorable time for a DB instance, use the AWS Console or Command Line Interface to look at the value returned in the LatestRestorableTime field for the DB instance. The latest restorable time for a DB instance is typically within 5 minutes of the current time.  

Database snapshots are user-initiated backups of your instance stored in Amazon S3 that are kept until you explicitly delete them. You can create a new instance from a database snapshots whenever you desire. Although database snapshots serve operationally as full backups, you are billed only for incremental storage use.

With Amazon RDS, you can copy DB snapshots and DB cluster snapshots. You can copy automated or manual snapshots. After you copy a snapshot, the copy is a manual snapshot. You can copy a snapshot within the same AWS Region, you can copy a snapshot across AWS Regions, and you can copy a snapshot across AWS accounts.

Using Amazon RDS, you can share a manual DB snapshot or DB cluster snapshot with other AWS accounts. Sharing a manual DB snapshot or DB cluster snapshot, whether encrypted or unencrypted, enables authorized AWS accounts to copy the snapshot.

Sharing an unencrypted manual DB snapshot enables authorized AWS accounts to directly restore a DB instance from the snapshot instead of taking a copy of it and restoring from that. This isn't supported for encrypted manual DB snapshots.

Sharing a manual DB cluster snapshot, whether encrypted or unencrypted, enables authorized AWS accounts to directly restore a DB cluster from the snapshot instead of taking a copy of it and restoring from that.