What potential security risks should be considered when using PHP for automated backups?

One potential security risk when using PHP for automated backups is the exposure of sensitive data if the backup files are not properly secured. To mitigate this risk, it is important to ensure that the backup files are stored in a secure location with restricted access permissions. Additionally, encrypting the backup files before storing them can add an extra layer of security.

// Example code snippet for encrypting backup files before storing them
$backupData = "sensitive data to be backed up";
$encryptedData = openssl_encrypt($backupData, 'AES-256-CBC', 'encryption_key', 0, 'encryption_iv');
file_put_contents('backup.enc', $encryptedData);