It depends... if after run the test plan everything goes fine, you should run the clean up immediately. Remember that depending of your storage vendor, the SRA may create snapshots of volumes on storage at DR site, and with that in mind, you can follow the recommendation to not run from snapshots for a long time, since that can use additional space in your storage.
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Richardson Porto
Senior Infrastructure Specialist
LinkedIn: http://linkedin.com/in/richardsonporto