You can checkpoint at a lower level https://en.m.wikipedia.org/wiki/Application_checkpointing https://en.m.wikipedia.org/wiki/Application_checkpointing or using

You can checkpoint at a lower level https://en.m.wikipedia.org/wiki/Application_checkpointing https://en.m.wikipedia.org/wiki/Application_checkpointing or using a virtual machine. But in practice it's not that useful to checkpoint a running program because of external state. You can't checkpoint sockets when they are connected to some other machine.