Is your feature request related to a problem?

App crashed and lost a lot of work

Describe the solution you'd like

Of course I could save often, but it wouldn't heart to have a temporary file saved, say, after changing a diagram or something. This could be loaded in case the program closes for some reason before saving. At least offer the option for that. Like there is on text editors and many other tools.

Describe alternatives you've considered

Just remember to save often.

Additional context

Add any other context or screenshots about the feature request here.