Updating TEST / REPORTING Databases from PROD

Hello,
We have a PROD db that's running 11.2.0.2 on AIX 7.1. We need to update two other instances (REPORTING and TEST) with fresh data... We want REPORTING to update nightly and TEST can update monthly, or less frequent.
I've looked into cloning or using imp/exp for the data schema, or possible RMAN DUPLICATE
Can anyone shed any light on what they use to update their non-production instances?
Thanks

We used to copy cold backup files to test every night for a Db larger than yours to run 2600 automated JUnit tests for a large financial client and never had any problem.
It was all automated using shell scripts to create new nightly folders, copy the files, checkout all DB and Java code from source control, do a complete Java build, run the automated tests and email the results to developers for them to review first thing in the morning.
For reporting using RMAN. The once a month copy a cold backup of reporting to TEST. Sure RMAN can do the TESt one too but I like to make sure my DBAs actually remember HOW to do a cold backup. Tends to make them remember how handy a text version of the control file and init file can be. New DBAs in particular get a pained expression on their face when they realize they can't use the control files they just copied because the folder structure is different and they don't have a text version.
Doing that monthly cold backup restore is a great training exercise that can be done with little risk.

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