In this video from Google Webmasters about content, https://www.youtube.com/watch?v=y8s6Y4mx9Vw around 0:57 it is advised to "archive any content that is no longer relevant".
My question is how do you exactly do that? By adding noindex to those pages, by removing all internal links to that page, by completely removing those from the website?
How do you technically archive content?
