What are the possibilities to replicate data from a production environment to a dev environment?

What's the dev environment? Is it a testing env?
To replicate a testing env, you can either use DB backup/restore or repotools -export/-import to create the testing database using the data or production database.
However you need to isolate the two network, avoid clients to access both of the two environments. The operation may also involves server renaming.
For server renaming scenario, please see http://pic.dhe.ibm.com/infocenter/clmhelp/v4r0m6/topic/com.ibm.jazz.install.doc/topics/c_server_rename_sup_unsup.html
The most important, backup the production environment before any action.

Hello Luiz,

this link also describes a similar scenario:

Staging a test environment for the upgrade process
http://pic.dhe.ibm.com/infocenter/clmhelp/v4r0m6/topic/com.ibm.jazz.install.doc/topics/t_prepare_staging_env.html

Best Regards,

Francesco Chiossi