Diagram titled "Writes go to the publisher, reads come from the subscribers," for Virtuoso Replication Cluster Edition on AWS Marketplace. Writers send SPARQL, SQL, or shell commands as dba from their IP addresses to a single Publisher node that takes all the writes, is backed up every 24 hours, and keeps each backup for 30 days. The publisher uses asynchronous replication to Subscriber 1 and Subscriber 2 (read-only copies) and, on larger plans only, Subscribers 3 to 5. Readers query the subscribers through public SPARQL or TLS SQL as reader. Footer: OpenLink Software, transactional replication, one publisher to two–five subscribers.