[enriquto]

yes, but this is a mock-up of a real freeze. What I want is independent of tmux: a way to freeze a process and all its children and save it into a file. The file is then opened when rebooting, or even on a different computer. There was this:

    https://github.com/maaziz/cryopid

[madmax96]

Have you looked at CRIU?

[enriquto]

Yes, but does it really work? The documentation is written in the future tense.

[madmax96]

It works for most things. You can always try it for your usecase and see how it goes.