dd qUeStion!!

[Manager]

Hello,

suppose I have a linux root partition /dev/hda1 on which I run dd to
capture the whole image of the partition to a file say.. backup.dd. now in
case of a crashed /dev/hda1 ..will I be able to restore each byte of it
including System/boot/data blocks by giving command  dd if=./backup.dd
of=./dev/hda1.....

Please clarify

ONe more question.....

How do I do disk mirroring in Linux ?

Thanks in  advance

Deep