I don't know if this is relevant, but I've been intrigued by DragonflyBSD's "vkernel" [0] feature which (supposedly) allows for cloning the entire runtime state of the machine (established TCP connections, etc.) into a completely new userland memory space. I think they use it mostly for kernel debugging right now, but it's interesting to think about the possibilities of being able to just clone an entire running operating system to a new computer without interrupting even a single instruction.

[0] https://www.dragonflybsd.org/docs/handbook/vkernel/