The metric name itself won't necessarily contain backend. There should be a folder titled Backend under the Agent.
However if you have no Frontend metrics, then you won't see any Backend folder.
Your application needs to have a backend and expose backend methods.
Glossary - CA Application Performance Management - 10.3 - CA Technologies Documentation
backend
An Introscope backend is an external system that a web application relies on for some portion of its processing. For example, a backend might be a database, a mail server, a transaction processing system, or a messaging system.
Introscope automatically identifies databases as backend systems by the name of the database. For other external systems, Introscope analyzes the socket activity of the application. Introscope names the backend based on the IP address and port that the application is communicating over.
See also: frontend
In 10.5, we have automatic backend discovery
CA APM Release Notes - CA Application Performance Management - 10.5 - CA Technologies Documentation
Automatic Backends
The Java agent now automatically discovers and instruments classes and method having the characteristics of backends. You can view automatic backends in WebView, Workstation, and Team Center.
More Information: Understand Automatic Backends