why rdiff backup needs to be installed on server end as well?

I am newbie in working with rdiff. I am taking the backup using rdiff from client 开发者_运维知识库to server end. can anyone tell me why we need to install rdiff backup at server end as well? hwo it works? rdiff access file systems of connect to the rdiff on server?

The suggested solution with mountable file systems are barely usable though. And that is exactly why you need rdiff on the server, as it makes delta calculations and optimizes the throughput by sending only information needed as a result. Otherwise why even bother using rdiff at all ...

Actually you don't need rdiff on the remote side... if you have SFTP-access. Have a look at this article on the rdiff wiki page.

In general you don't need rdiff on the remote side if you can access the remote filesystem in some other way like NFS or CIFS (although CIFS has been troublesome for some users).