I think the performance is OK.
In my system,it toke  21 mins 30 secs to backup about 13G data.


  
  Start time:             14-Nov-2011 09:57:24
  End time:               14-Nov-2011 10:18:54
  Elapsed time:           21 mins 30 secs
  Priority:               10
  FD Files Written:       5,159
  SD Files Written:       5,159
  FD Bytes Written:       12,841,980,807 (12.84 GB)
  SD Bytes Written:       12,842,912,455 (12.84 GB)
  Rate:                   9955.0 KB/s

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