I think it is a good idea, if you have a favorite site, which has a RSS source, to make a call to store it regularly in archive.org for 'the next generations'. https://help.archive.org/help/save-pages-in-the-wayback-machine/.
I have updated my RSS client to make a such call everyday, even for my fav YouTube RSS sources.
Even if 'link rot' gets in a way, this might be insightful to see at least link, or title, or description of the RSS entry. Historians might consider it useful some day.