No, Amazon Redshift snapshots are encrypted together with the data at the same time your Amazon Redshift cluster is encrypted. However, you can encrypt a previously unencrypted cluster, but only the subsequent snapshots will be encrypted.
For more information, see [Encrypt your previously unencrypted Amazon Redshift cluster with 1-click] (https://aws.amazon.com/about-aws/whats-new/2018/10/encrypt-amazon-redshift-1-click/). Also, Amazon Redshift database encryption in the Redshift cluster management guide.
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