On 7/18/2011 10:08 AM, Isterklister wrote:
> Hello,
> is there a way to backup over an unstable WAN link (it is only short breaks 
> so that the SSH tunnel is broken). I use rsync over SSH, unfortunately, fails 
> the backup each time the line is broken.
>
> Is there a way to restart the backup until it is finished? Now all backup 
> stops and are discarded each time the ssh tunnel are broken and the backup 
> will never be finished.

Interrupted full runs should result in a 'partial' backup that is used 
by rsync to continue on the next attempt.  However, because fulls do a 
read and checksum comparison on all data, continuing can still be a slow 
process even though it doesn't use the bandwidth to send matching data 
again.  I don't think there is much you can do to improve that. 
Enabling compression on the ssh connection might help get more data 
across while the connection stays up.  Turning on keep-alives in ssh 
might help if some equipment in the connection path is dropping the link 
due to idle time.

You might use standard rsync to make a local snapshot copy of the 
target, restarting as needed, then let backuppc copy that to keep a history.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com

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