public void setScheduleExpression(String scheduleExpression) {
        this.scheduleExpression = scheduleExpression;
    }
<p>
A CRON expression in UTC specifying when Backup initiates a backup job.
</p>

@param scheduleExpression
       A CRON expression in UTC specifying when Backup initiates a backup job.
aws-java-sdk-backup/src/main/java/com/amazonaws/services/backup/model/BackupRuleInput.java