Benjamin Franz:
> > Is the following possible?
> >
> > - put the replacement drive into an empty bay
> > - clone /dev/sda onto it like: /dd if=/dev/sda of=/dev/sdc
> > /- move the new drive into the /dev/sda drive bay
> 
> Only if you boot from a different disk. You can't use dd to make a good 
> copy of a mounted filesystem.

You can boot with the file system read only.  Then it would be ok to
use tthe file system you are copying.

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