Just discovered that admins are removing resource-content on the subreddit. Both the DPRK and China megathreads that are in the sidebar have been removed, probably others too.
I doubt this is unique to only /r/communism, /r/communism101 is probably going to be hit as well.
DRPK 1 / alternate
DPRK 2 / alternate
Don't know if this is the China 1 but it's the one I had saved / alternate
Edit: archive.org is indeed kinda shitty and very damn slow.
i archived this one too just in case
https://web.archive.org/web/20201111154740/https://www.reddit.com/r/communism/comments/jbcomt/studying_china_a_resource_for_political_economy/
Do remember that archive.org sometimes excludes and removes things.
https://theoutline.com/post/4653/the-internet-s-collective-memory-is-unstable-as-hell
https://gizmodo.com/when-the-internet-archive-forgets-1830462131
https://archiveteam.org/index.php/List_of_websites_excluded_from_the_Wayback_Machine
They are mostly reliable but if there is something you really care about then keep a local copy.
An example: https://web.archive.org/web/http://clarkesworldmagazine.com/fall_01_20
Same page can be found here: http://archive.is/oXDEt (controversial but good story if you can read past its title)