public String getScheduleExpression() {
        return this.scheduleExpression;
    }
<p>
A cron expression in UTC specifying when Backup initiates a backup job. For more information about Amazon Web
Services cron expressions, see <a
href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html">Schedule Expressions for
Rules</a> in the <i>Amazon CloudWatch Events User Guide.</i>. Two examples of Amazon Web Services cron
expressions are <code> 15 * ? * * *</code> (take a backup every hour at 15 minutes past the hour) and
<code>0 12 * * ? *</code> (take a backup every day at 12 noon UTC). For a table of examples, click the preceding
link and scroll down the page.
</p>

@return A cron expression in UTC specifying when Backup initiates a backup job. For more information about Amazon
        Web Services cron expressions, see <a
        href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html">Schedule
        Expressions for Rules</a> in the <i>Amazon CloudWatch Events User Guide.</i>. Two examples of Amazon Web
        Services cron expressions are <code> 15 * ? * * *</code> (take a backup every hour at 15 minutes past the
        hour) and <code>0 12 * * ? *</code> (take a backup every day at 12 noon UTC). For a table of examples,
        click the preceding link and scroll down the page.
aws-java-sdk-backup/src/main/java/com/amazonaws/services/backup/model/BackupRule.java