This is a concept where we look to preserve some old websites, yet upgrade them.
I have two specific examples, one is easy, the other one is loooong.
easy first example. Back in the day I supported a band called https://nowtheband.com/... well i used to help those folk out back years ago. Well I still do from time-to-time, but not in a web presence way.
SO the site was classic ASP with some SQL server, hosted underneath my desk, on cable broadband. Or was it JSP with mysql? I don't know. Anyway the source code was culled from my archive a long time ago. What happened after say fifteen years? Well the band want an anniversary bash!
How do I get the original site back up and running? I was thinking of a virtual machine, but then I remembered the code was culled as it is over ten years old. No problem, the important parts are archived courtesy of the wayback machine http://web.archive.org/web/20020720150154/http://www.nownow.info:80/
the website works reasonably enough, to make some screen grabs of. part 2 to follow