You can revisit the early days of Linux through MiDesktop, a modern fork of the original KDE 1. It's a must-try nostalgic experiment.
You point your browser at a local IP address or hostname and suddenly you have a full XFCE desktop running in your browser.
The worst-case scenario has befallen even the most careful computer user: a coffee mug spills on your laptop or an update wipes all your files and photos. Despite your best effort, accidents happen.