1. A method comprising: executing machine-readable instructions by one or more processors to: generate, in response to one or more signals representing one or more queries received at a local computing site, one or more signals representing a first replication threshold identifying attributes of one or more documents from a remote computing site to be replicated at said local computing site; and generate one or more signals representing a second replication threshold determining, at least in part, that at least one entry of a posting list stored at said remote computing site is to be replicated at said local computing site.