if the client initiates the connection and provides and ssh tunnel, backuppc can be setup to connect to 127.0.0.1 with the appropriate port for the tunnel, then the client can connect to the server and the server can backup the client over the ssh connection.

On Jan 30, 2008 2:43 PM, Stephen Joyce <stephen@physics.unc.edu> wrote:
On Wed, 30 Jan 2008, Les Mikesell wrote:

> Carl Wilhelm Soderstrom wrote:
>> On 01/23 06:39 , Greg WhitleyMott wrote:
>>> BackupPC has served well in a couple organizations i've setup.  but now
>>> i need to setup something that works across the internet, and it looks
>>> like BackupPC can't do that.  i'm sad, i'd much rather use BackupPC than
>>> rdiff-backup or safekeep or whatever i'll have to use instead..
>>
>> Why won't it work across the Internet?
>> I've used it in several installations where I backed up machines that were
>> thousands of miles apart in some cases. Generally all I had to do was to
>> raise the ping timeout limits. It's also adviseable to turn on compression
>> options in your ssh command; and in some cases you may want to do
>> rate-limiting in the rsync command so as not to crush someone's bandwidth.
>>
>> It's the best tool I've found for doing backups across the Internet.
>
> The only real requirement that might be a problem is that the server has
> to initiate the connection to the clients.  If the client side has a
> firewall that only allows outbound connections or sits behind a NAT
> gateway you may need to set up a VPN to the server or do some tricky ssh
> tunneling, but any of several options will work.

I'm still using the process at
http://www.physics.unc.edu/~stephen/on-demand-backuppc/ with good results.

Cheers, Stephen
--
Stephen Joyce
Systems Administrator                                            P A N I C
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University of North Carolina at Chapel Hill         Network Infrastructure
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Don't judge a book by its movie.

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