dd is most certainly the best cloning tool, it will create a 100% replica simply by using the following command. I’ve never once had any problems with it.
dd if=/dev/sda of=/dev/sdb bs=32M
Be aware that while cloning every byte, you should not use this on a drive or partition that is being used. Especially applications like databases can’t cope with this very well and you might end up with corrupted data.
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