Mirror hard disk using dd.

[Ruben de Groot]

On Wed, Aug 04, 2004 at 10:49:26AM +0200, Livhu Tshisikule typed:
> Hi,
> 
> I installed a second harddisk on my FBSD 5.2.1 box and then use dd if=/dev/ado 
> of=/dev/ad1. I later removed my first disk so that I can test the second 
> disk. After booting it goes to single user mode and then I used fsck -y 
> command. I then mounted the /usr only to find that id did not copy everything 
> from the first disk.
> 
> 1. I want to make an exact copy of the first disk, how can I do that.
> 2. Later I want to copy what has changed to disk2 once a day. 

use dump(8) and restore(8)