Best practices and considerations for a Candidate Data Purge

Summary: I'd like to hear from others regarding best practices and considerations before turning on the candidate data purge schedule.

Content (required):We have not yet set up a candidate purge schedule. Before I do that, I'd like to hear from other TBE administrators that have done a candidate data purge. What are your best practices? What are some considerations we should think through before implementing?

Version (include the version you are using, if applicable): TBE

Code Snippet (add any code snippets that support your topic, if applicable):