public String getEncryptionKeyArn() {
        return this.encryptionKeyArn;
    }
<p>
The unique ARN associated with the server-side encryption key. You can specify a key to encrypt your backups from
services that support full Backup management. If you do not specify a key, Backup creates an KMS key for you by
default.
</p>

@return The unique ARN associated with the server-side encryption key. You can specify a key to encrypt your
        backups from services that support full Backup management. If you do not specify a key, Backup creates an
        KMS key for you by default.
aws-java-sdk-securityhub/src/main/java/com/amazonaws/services/securityhub/model/AwsBackupBackupVaultDetails.java