Archiving/Deleting Old Data

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We implemented NET Community in 2014 and have not cleaned up old data EVER!  As we migrate to a new website but will continue to use our membership/donation/registration form integration parts/pages, I'd like to archive and cleanup our old data.  Has anyone embarked on this project and have any tips?  There doesn't seem to be a very holistic way to look at all pages/parts, live/expired, to make things easier.  Thanks!
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