These are different products completely separate from Netbackup.
Veritas Replication Exec 3.1 helps organizations ensure continuous, around-the-clock protection of Microsoft SQL and Exchange applications. With Replication Exec, data is copied from the application server to a secondary standby server in real time as files are created or changed. By ensuring the data is always protected and readily accessible, Replication Exec helps minimize downtime due to server loss.
http://www.symantec.com/business/replication-exec
Veritas Volume Replicator provides a world-class foundation for continuous data replication, enabling rapid and reliable recovery of critical applications at remote recovery sites. As an option to Veritas Storage Foundation by Symantec, Volume Replicator enables efficient replication of data over IP networks, offering an extremely flexible, high-performance alternative to traditional array-based replication architectures.
http://www.symantec.com/business/products/sysreq.jsp?pcid=pcat_business_cont&pvid=3_1
