Reload for Retain will need to be installed, configured and licensed.
Apache, a Database Management System and Retain will need to be installed, but not configured. The Retain configuration will be copied from the production Retain server.
The Reload for Retain Agent will need to be installed and configured.
An initial backup will have to be run and this will take significant time depending on how large your production system is.
Once the initial backup is complete, the backup the logs will need to be checked for errors, and backup access will need to be tested.