Way to rollback to a previous state

**Motivation**
Have a way to enable 'roll back to previous state' without using git. Using git works but something more lightweight would be ideal when working on a project with multiple steps, prompts. Sometimes Q gets lost or goes off in a wrong direction and I want to say "go back one step". This is even more important where you use the "/acceptall" model. The guiding principle is for the user to never lose work and always be able to revert to working state.