// 自动备份插件
function automatic_backup() {
  // Backup database
  $backup_database_command = 'mysqldump -u username -ppassword database_name > backup.sql';
  exec($backup_database_command);
 
  // Backup files
  $backup_files_command = 'tar -czf backup_files.tar.gz /var/www/html';
  exec($backup_files_command);
}
 
// 每日备份
if ( ! wp_next_scheduled( 'automatic_backup_event' ) ) {
  wp_schedule_event( time(), 'daily', 'automatic_backup_event' );
}

add_action( 'automatic_backup_event', 'automatic_backup' );