What is the maximum limit to keep the history of a workflow that has run. It doesn’t matter if the workflow is approved/declined or cancelled. If the solution is to keep the history in some kind of archive database available through SharePoint 2010/2013 that would be acceptable.

For legel/financial reasons we would like to keep the history for more than 8 years.

Is there a difference of the functionality requested above between Nintex Workflow 2010 and Nintex Workflow 2013?