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Here's another ownership strategy — and it's just as important. Undo doesn't cover everything. Some operations can't be undone. And sometimes you need to go deep into an experiment — multiple steps in — before you can tell whether it worked. That's why you need a way to lock in a "known good" state before you start experimenting. That's what saving is for. You've probably been told to save often as a safety measure. But saving over your file mid-experiment can actually destroy your last known