Rsync to spare disk

Matt McCutchen hashproduct+rsync at
Sat Dec 23 03:22:09 GMT 2006

On 12/21/06, klemen <klemen at> wrote:
> OK, i tryed with simpliest command:
> dd if=/dev/sd0 of=/dev/sd1/backup
> and get
> dd: /dev/sd0: Device busy
> ps: the os is openbsd

I'm guessing OpenBSD doesn't let you directly read a block device
containing a mounted filesystem.  To make a raw backup of the main
disk, you might need to reboot the machine to a live disk, or it might
be enough to remount the filesystem read-only.  Alternatively, you
could make a file-level backup using rsync while the machine is
running normally.


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