For ones that begin as Support requests, we often distil all the answers/knowledge into a FAQ or guide, and close the topic off with a post including a nice onebox link to the new one so people Watching the topic get a ping (though you can also pop a link at the top in staff notice or insert a note in the OP as well). This helps to preserve the history with the built-in backlinking, but also the ‘discovery route’ as well, if people are finding the original through google or onsite search.
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