> I have a webserver with postgresql. I would have a backup from this
> database. It should also be possible to query this backup solution.
> So I think slony would be a good choice. Am I right?
Slony will replicate the data from selected tables for you, and the
replicated database will be available for queries. So it will work for
you unless you face performance limits, or have some problem with
asynchronous updates, or find Slony setup to be too difficult.