magento-test/app/code/Magento/Backup/etc/adminhtml/system.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="system">
            <group id="backup" translate="label" type="text" sortOrder="500" showInDefault="1">
                <label>Backup Settings</label>
                <field id="functionality_enabled" translate="label" type="select" sortOrder="5" showInDefault="1">
                    <label>Enable Backup</label>
                    <comment>Disabled by default for security reasons.</comment>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                </field>
                <field id="enabled" translate="label" type="select" sortOrder="10" showInDefault="1">
                    <label>Enable Scheduled Backup</label>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                    <depends>
                        <field id="functionality_enabled">1</field>
                    </depends>
                </field>
                <field id="type" translate="label" type="select" sortOrder="20" showInDefault="1">
                    <label>Scheduled Backup Type</label>
                    <depends>
                        <field id="enabled">1</field>
                        <field id="functionality_enabled">1</field>
                    </depends>
                    <source_model>Magento\Backup\Model\Config\Source\Type</source_model>
                </field>
                <field id="time" translate="label" type="time" sortOrder="30" showInDefault="1">
                    <label>Start Time</label>
                    <depends>
                        <field id="enabled">1</field>
                        <field id="functionality_enabled">1</field>
                    </depends>
                </field>
                <field id="frequency" translate="label" type="select" sortOrder="40" showInDefault="1">
                    <label>Frequency</label>
                    <depends>
                        <field id="enabled">1</field>
                        <field id="functionality_enabled">1</field>
                    </depends>
                    <source_model>Magento\Cron\Model\Config\Source\Frequency</source_model>
                    <backend_model>Magento\Backup\Model\Config\Backend\Cron</backend_model>
                </field>
                <field id="maintenance" translate="label comment" type="select" sortOrder="50" showInDefault="1">
                    <label>Maintenance Mode</label>
                    <comment>Please put your store into maintenance mode during backup.</comment>
                    <depends>
                        <field id="enabled">1</field>
                        <field id="functionality_enabled">1</field>
                    </depends>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                </field>
            </group>
        </section>
    </system>
</config>