> 
> and thanks for your fast feedback,
> but i have many times read that it's not a good way to backup 
> aliving system, its possible that i boot from cdrom and make a 
> dump of /dev/sd0a /dev/rmt/0 (i thing so i can take the hole slice)
> or its a other way todo this ???

You don't need to boot from a CDROM to get a quiescent system.  Just
do the dump from single-user mode.

David S.

>