archive.org has a great web archive – containing many archived revisions of all web pages. You might even know that – if not, try it out! Even sites are archived which are offline since ages! Archive.org works since 1998(!) – shortly after the beginning of the internet itself!
Why do I write this blog post? What does this have to do with LibreOffice?
It’s rather easy: eskiwiki and trwiki (which I do try to integrate into tdfwiki) do both based on a not maintained server where nobody has access. There is a great tool and initiative out there called wikiteam, who does try to archive and make dumps of wikis accessible (not only mediawiki).
I do know that there are requests to get content of the “wiki Pardus” (the offline wiki of the Linux distribution Pardus) and what a luck there is a backup of the Pardus wiki in their archives.
So again: If you know a great resource (even offline) for help pages, FAQ pages, tutorials, wikis, etc. pp. then ask us.