Agreed that it is preferred way, after raw dd with unmounted filesystem. But I need to be prepared for that: I am a human, I can forget some steps. Here command

Agreed that it is preferred way, after raw dd with unmounted filesystem. But I need to be prepared for that: I am a human, I can forget some steps. Here command takes only two arguments (src and dst) -- simplicity is reliability against humand mistakes. Some data will be corrupted, but with journaling filesystems or something like ZFS this is not dangerous (unfinished transactions will be ignored).