Re: Multi master use case?

Is this a case for multi master do you think? 

I.e. running one on the internet, one locally.

Yes, could be.

b) changing schemas (new tables, fields, views etc.) as well as data

That's a tall order; I don't think anything will do that automatically, 
although rubyrep claims to at least pick up new tables.

Any experiences/thoughts?

My experience is with Bucardo, which should do the job admirably 
(but with the data only). My advice would be to just set up a test 
system and try rubyrep and Bucardo out. For the latter, use the 
latest Bucardo5 beta, as Bucardo4 will be deprecated soon:

http://bucardo.org/downloads/Bucardo-4.99.3.tar.gz