Jerry McAllister schrieb:
On Fri, Oct 31, 2008 at 09:48:16AM +0100, Christoph Kukulies wrote:

Hi list,

I'm considering using a bootable USB stick with FreeBSD to perform a backup of my notebooks' 500 GB hard disk to a physically identical (same make, same type, same size) hard disk attached to USB.

What would be the fastest way to do that sector by sector copy? I'm using dd right now,

dd if=/dev/ad0 of=/dev/da0 bs=10000000

but maybe there is a utility which does this faster or a larger buffer size? Probably the limit will be
the USB 2.0 bus speed anyway?

Are you sure you want to do a sector-by-sector copy?
That won't get you much that is useful in terms of a backup.

Can't you use dump/restore instead?

Dump each file system on /dev/ad0 to a file on /dev/da0.

Create a file system on /dev/da0 using newfs first.   You may or
may not want to create a FreeBSD slice and partition there before
doing the newfs. Make a mount point and mount it.

mkdir /bkmnt
mount /dev/da0 /bkmnt    Or if you created slice and partition in /dev/da0
                         mount /dev/da0s1a /bkmnt

Then do the dumps

  dump 0af /bkmnt/rootbackup /
  dump 0af /bkmnt/usrbackup /usr
  dump 0af /bkmnt/homehackup /home

etc for whatever file systems you want to back up.

You will be much better off than with a sector by sector copy.


The idea was to have a drop in backup for my notebook that allows me to continue working with a minimum of delay. (requires a philips screwdriver though :-)

Of course a failure of the source disk while doing the image copy as the worst case scenario
would leave me with empty hands :-)

There are a couple of partitions with different OSs on that hard drive.


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