public void setManualSnapshotRetentionPeriod(Integer manualSnapshotRetentionPeriod) {
        this.manualSnapshotRetentionPeriod = manualSnapshotRetentionPeriod;
    }
<p>
The default number of days to retain a manual snapshot. If the value is -1, the snapshot is retained
indefinitely. This setting doesn't change the retention period of existing snapshots.
</p>
<p>
The value must be either -1 or an integer between 1 and 3,653.
</p>

@param manualSnapshotRetentionPeriod
       The default number of days to retain a manual snapshot. If the value is -1, the snapshot is retained
       indefinitely. This setting doesn't change the retention period of existing snapshots.</p>
       <p>
       The value must be either -1 or an integer between 1 and 3,653.
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/Cluster.java