On Tue, Aug 28, 2007 at 03:56:22PM +0300, Maya Bercovich wrote:
>    sendsize[7228]: time 0.004: running "/sbin/dump 0sf 1048576 - 
> /Users/amanda/sync"

Mac OS X includes 'dump', but does not, by default, create any
filesystems that 'dump' can handle.  You'll need to use 
  program "GNUTAR"
in your disktype for this client.

Dustin

-- 
        Dustin J. Mitchell
        Storage Software Engineer, Zmanda, Inc.
        http://www.zmanda.com/