Scheduled backup script

backup.php

<?php

class Backup
{
    protected $logFilePath;
    
    public function __construct($logFilePath)
    {
        $this->logFilePath = $logFilePath;
    }
    
    public function backup($source, $destination)
    {
        $this->log("Begin backup of $source to $destination");
        
        if (!extension_loaded('zip')) {
            $this->log('Zip extension is required');
            return false;
        }
        
        if (!file_exists($source)) {
            $this->log("Source not found");
            return false;
        }
        
        $zip = new ZipArchive();
        $ret = $zip->open($destination, ZIPARCHIVE::CREATE);
        
        if (true !== $ret) {
            $this->log("Destination open error, error code: $ret");
            return false;
        }

        $source = str_replace('\\', '/', realpath($source));

        if (is_dir($source)) {
            $files = new RecursiveIteratorIterator(
                new RecursiveDirectoryIterator($source), 
                RecursiveIteratorIterator::SELF_FIRST
            );

            foreach ($files as $file) {
                $file = str_replace('\\', '/', realpath($file));

                if (is_dir($file)) {
                    $zip->addEmptyDir(str_replace($source . '/', '', $file . '/'));
                } elseif (is_file($file)) {
                    $zip->addFromString(str_replace($source . '/', '', $file), file_get_contents($file));
                }
            }
        } elseif (is_file($source)) {
            $zip->addFromString(basename($source), file_get_contents($source));
        }
        
        if (!$zip->close()) {
            $this->log("Destination close error");
        }
        
        $this->log("End backup of $source");
    }

    protected function log($message)
    {
        file_put_contents(
            $this->logFilePath, 
            date('Y-m-d H:i:s') . ' ' . $message . PHP_EOL, 
            FILE_APPEND
        );
    }
}

$rootDirPath = dirname(__DIR__);
$backupDirPath = $rootDirPath . '/backup';
$backupDestDirPath = $backupDirPath . '/' . date('Y-m');
$today = date('Y-m-d');
$backup = new Backup($backupDirPath . '/backup.log');

if (!is_dir($backupDestDirPath)) {
    mkdir($backupDestDirPath);
}

$backup->backup("$rootDirPath/freshrss/data", "$backupDestDirPath/freshrss-$today.zip");
$backup->backup("$rootDirPath/shaarli/data", "$backupDestDirPath/shaarli-$today.zip");