Assembling the list of links to archive is a manual process--I just log them in an Obsidian notebook with a category and summary, and I later post it to my blog. (I don't really think other people care, it's more for me to be able to find past things I've found interesting.)

For the archival process I use ArchiveBox[1] running as a container on my NAS; I just grep through the note for `http|https` and feed the resulting list to the archiver. For everything not-hackernews I set the depth to 1, but for HN threads I do 2 so I grab whatever people may have linked in the comments.

I think there's ways to hook into like, ALL Firefox history or saved posts on reddit, but that's way heavier than what I care for.

[1]: https://archivebox.io/