HP B6960-96035 - Manual (Page 250)

Supported configurations
Three hosts: CM, application, Resolve
This solution uses three hosts: one each for the Cell Manager, Resolve Agent, and
application. Although this configuration requires three machines, the Resolve host
can be a less expensive host and the resource load is split, helping you avoid
performance impact on the application.
Note that in this configuration, the Cell Manager host can be running any of the
operating systems supported by Data Protector. The application and Resolve Agent
hosts must be running HP-UX 11.11.
Direct backup 250