Have you looked at rsync?

It can transport over ssh encrypted channels and moves only the changed
data. It's optimized for slow (as in WAN) links.


hufaunder@yahoo.com wrote:
> I want to backup my data in a remote location. The total size of the
> data is about 500GB but the incremental data is comparably small. A
> commercial online backup service is one option but I much prefer a
> backup on a family's computer on a different continent. In any case,
> here are the requirements:
>
> 1) Data must be strongly encrypted before sending it over the wire.
> 2) When a connection breaks the backup process has to pick up where it
> stopped, i.e. without data corruption or having to resend the data.
> 3) Incremental backup is a MUST.
> 4) It must be possible to automatically backup data from different
> locations within an internal network.
> 5) The solution should be inexpensive (<$200).
>
> Is there anything out there that can handle this? Any input is
> appreciated.
>