public Long getMaxRetentionDays() {
        return this.maxRetentionDays;
    }
<p>
This is the setting that specifies the maximum retention period that the vault retains its recovery points. If
this parameter is not specified, Backup does not enforce a maximum retention period on the recovery points in the
vault (allowing indefinite storage).
</p>
<p>
If specified, any backup or copy job to the vault must have a lifecycle policy with a retention period equal to
or shorter than the maximum retention period. If the job retention period is longer than that maximum retention
period, then the vault fails the backup or copy job, and you should either modify your lifecycle settings or use
a different vault.
</p>

@return This is the setting that specifies the maximum retention period that the vault retains its recovery
        points. If this parameter is not specified, Backup does not enforce a maximum retention period on the
        recovery points in the vault (allowing indefinite storage).</p>
        <p>
        If specified, any backup or copy job to the vault must have a lifecycle policy with a retention period
        equal to or shorter than the maximum retention period. If the job retention period is longer than that
        maximum retention period, then the vault fails the backup or copy job, and you should either modify your
        lifecycle settings or use a different vault.
aws-java-sdk-backup/src/main/java/com/amazonaws/services/backup/model/CreateLogicallyAirGappedBackupVaultRequest.java