archive.today is very popular on HN; the opaque, shortened URLs are promoted on HN every day
I can't use archive.today. I tried but gave up. Too many hassles. I might be in the minority but I know I'm not the only one. As it happens. I have not found any site that I cannot access without it
The most important issue with archive.today though is the person running it, their past and present behaviour. It speaks for itself
Whomever it is, they have lot of info about HN users' reading habits given that archive.today URLs are so heavily promoted by HN submitters, commenters and moderators