People make mistakes, that's why we automate things.
If a system relies on a human not making mistakes it is doomed to fail eventually.
Saving manually should be a feature, but autoaave should be on by default these days, unless 30+ years of people losing work due to not hitting "save" manually has taught us nothing.
Crashes happen. Errors happen. Pets and children happen.
Any major document editor should be able to auto save and replay a very long history of actions.
Improve the system, because you can't improve people with a code patch.