Once you've completed your research and have published research article(s) on your findings, you must archive your data to allow for verification of your results. Further guidance on archiving in the faculty can be found here.
You may also wish to publish the data generated during your research so that it can be reused by other researchers for new purposes. However, it is very important that you have ensured that all privacy, legal and ethical requirements have been met before doing so. This is why the planning stage is so important.