from what I gather, though I’m fuzzy on the details, it’s all being actively archived by datahoarders and can be accessed by the wayback machine. I feel if that’s accurate, it’s a good stopgap to save the data and will be able to move to a more stable and organized location later.
I’ve been using the Reddit to Wayback machine firefox addon to access the posts you describe; things on technical niche topics. So far, I haven’t had problems with a post not being archived, but the more recent posts have had some missing comments (after double checking with old.reddit)