Do-It-Yourself Internet Archiving?

A moron asks: "Web pages change and disappear all the time. For legal and historical purposes, I need to have accessible archives of the websites I maintain. I'm basically looking for a do-it-yourself version of Internet Archive's Way Back Machine which provides a simple versioning system and accessibility through web interface. Is there already software that does this? If not, what ideas does Slashdot have to make such a system possible? How should it work? What existing tools can be used together to make a workable system?"

"There are all sorts of tools out there that will archive web pages, and each have other necessary features such as making links relative. I don't always have filesystem access to pages, so tools that rely on such access won't work. There are some obvious tools that do part of the job such as:

• curl
• wget
• httrack

But grabbing pages is only part of my, and I suspect many other peoples needs. The other pieces include intelligently archiving the pages, and making them accessible. If a page or a page element hasn't changed, there is no need to store multiple copies. The archives need to be easy for end users to navigate, search, and link."