archivebox is a totally rad tool for creating your own offline archive of all the web things, plus extracting music and PDF files, etc. A nice companion to the Bookmarks app and easy to deploy in Docker.
https://archive.org is a public archive of the open internet. Easy to create an account and submit your web links if you want them to live forever. The best way to dig up your old Friendster page is through the Wayback Machine. API-extensible.