implement diff backup schema on rsync GPL code.

[Daniel.Li]

Dear All,

I'm planning to implement diff backup feature on rsync. Currently, I
have seen delta data and data from server side.

And I have found that there are many case in current code, it seems a
lot of work to do to implement this feature.

Do you have any ideas, or suggestions on how to simply implement this
feature?

Thanks in advance!
-- 
Daniel Li