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SketchUp automatically looks for and fixes a variety of problems that might be present in your model. The General preferences pane includes a section called "Check Model for Problems", which offers the following option: Notify me when problems are fixed. If you’ve disabled the Welcome Window you can always access it by going to Help > Welcome to SketchUp. If you’re seeing a recovered file, you have the ability to open it and re-save it to a new location.
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Note: Want to find an auto-saved file? Recovered files will always be accessible from the Welcome Window’s main screen. If SketchUp closes successfully, the auto-save file is deleted. Note that the auto-save file is preserved only if SketchUp suddenly crashes. Just enter a new interval in minutes in the text box.
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By default, the interval is 5 minutes, but you can make that shorter or longer if you like. When enabled, Auto-save tells SketchUp to automatically save changes to your model into a temporary file at specific time interval.
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