Replicating hundreds of thousandw of rows

Hello,

we need to replicate hundreds of thousands of rows (for reporting) between Postgresql Database nodes that are in
differentlocations. 

Actually, we use Rubyrep with Postgresql 8.4.22.
It works fine but it is very slow with a massive numbers of rows.

With Postgresql 9.x, are there some ways to replicate (in background, not in real time!), these quantities of data?
We need a periodical syncronization..,

Thank you!
/F