Westborough, Massachusetts-based Epoch Systems Inc has released client-server back-up software for Oracle, Sybase, Informix and Ingres relational databases on iAPX-86 personal computers and stand-alone or networked Unix workstations and file servers. Enterprise Backup is available from November 30 on SunOS servers and Unix clients, and costs from $2,200 for five nodes to $50,000 for 500 nodes. NetWare client support will follow on December 31, as will support for Sybase 4.X, priced at $1,500 for five nodes and $40,000 for 500 nodes. Oracle7.X will follow in March 1994 at $2,200 for five nodes, $50,000 for 500 nodes.