Setup Mirror websites for an osCommerce website

Our main osCommerce site A is heavily modulated ( [login to view URL] ), We want to setup a mirror site B (both front and back ends are the same [login to view URL]) and a similar-looking site C (same front end, but back end has different content [login to view URL] ) Website A is hosted on a dedicated Linux server of [login to view URL] (MySQL5.0.67-community, PHP 5.2.9). We used to have a CGI script which synchronise sites A & B but it stopped working after a server upgrade. It was working well but it is very resource intensive. Websites B & C are hosted on a dedicated Linux server of [login to view URL] (MySQL 5.0, PHP?, SSH) Here are what you need to do: [login to view URL] sites B & C (identical copies of site A) [login to view URL] I to synchronise site A and B so that B remains an identical copy of A [login to view URL] II to synchronise the product-related tables between site A and C, as well as the product images under folders (catalog/images and catalog/image2) Both Script I and Script II should be able to auto-run periodically and manually.