Amazon RDS backups are configured to run every night between 5 and 6 UTC. The last 30 days of backups are retained. AWS automatically encrypts each backup. See Working with backups for additional information.
EC2 EBS Volume Backups
EBS Lifecycle Manager generates a daily snapshot of each EBS volume associated with an EC2 instance that has a "snapshots:enabled" tag. These snapshots are retained for 5 days by default.
For assistance with restoring a database or EBS backup, please create a support ticket.