Cron.php

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<?php
namespace Magento\Backup\Model\Config\Backend;

class Cron extends \Magento\Framework\App\Config\Value
{
    const CRON_STRING_PATH = 'crontab/default/jobs/system_backup/schedule/cron_expr';

    const CRON_MODEL_PATH = 'crontab/default/jobs/system_backup/run/model';

    const XML_PATH_BACKUP_ENABLED = 'groups/backup/fields/enabled/value';

    const XML_PATH_BACKUP_TIME = 'groups/backup/fields/time/value';

    const XML_PATH_BACKUP_FREQUENCY = 'groups/backup/fields/frequency/value';

    protected $_configValueFactory;

    protected $_runModelPath = '';

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Framework\App\Config\ValueFactory $configValueFactory,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        $runModelPath = '',
        array $data = []
    ) {
        $this->_runModelPath = $runModelPath;
        $this->_configValueFactory = $configValueFactory;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }

    public function afterSave()
    {
        $enabled = $this->getData(self::XML_PATH_BACKUP_ENABLED);
        $time = $this->getData(self::XML_PATH_BACKUP_TIME);
        $frequency = $this->getData(self::XML_PATH_BACKUP_FREQUENCY);

        $frequencyWeekly = \Magento\Cron\Model\Config\Source\Frequency::CRON_WEEKLY;
        $frequencyMonthly = \Magento\Cron\Model\Config\Source\Frequency::CRON_MONTHLY;

        if ($enabled) {
            $cronExprArray = [
                (int) $time[1],                                 # Minute
                (int) $time[0],                                 # Hour
                $frequency == $frequencyMonthly ? '1' : '*',      # Day of the Month
                '*',                                              # Month of the Year
                $frequency == $frequencyWeekly ? '1' : '*',        # Day of the Week
            ];
            $cronExprString = join(' ', $cronExprArray);
        } else {
            $cronExprString = '';
        }

        try {
            $this->_configValueFactory->create()->load(
                self::CRON_STRING_PATH,
                'path'
            )->setValue(
                $cronExprString
            )->setPath(
                self::CRON_STRING_PATH
            )->save();

            $this->_configValueFactory->create()->load(
                self::CRON_MODEL_PATH,
                'path'
            )->setValue(
                $this->_runModelPath
            )->setPath(
                self::CRON_MODEL_PATH
            )->save();
        } catch (\Exception $e) {
            throw new \Magento\Framework\Exception\LocalizedException(__('We can\'t save the Cron expression.'));
        }
        return parent::afterSave();
    }
}