Rsync to spare disk

[klemen]

Stuart Halliday wrote:
> 
>> Hello
>> 
>> I have an main disk (operating system) and an spare disk for backup.
>> Is it possible with rsync command  to copy whole disk n1 to disk2?
>> 
>> Like: #rsync -av /dev/sd0 /dev/sd1
> 
> It will not copy open files.
> 
> I use 
> 
> dd if=/dev/sd0 of=/dev/sd1 bs=1024k
> e2label /dev/sd1 /backup
> 
> Much better and safer.
> 
> Read this:
> http://www.crazytrain.com/dd.html
> 
> 
> 
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> 

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

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