I’m fairly new to Sketchup, but from the Knowledge Center, it is described that there is an auto save file that is supposed to be created. Every 5 minutes as the setting suggests.
From the Sketchup Knowledge Center:
Does SketchUp create auto-save files?
By default, SketchUp automatically saves your files every five minutes while you’re actively working. If, for example, you’re working on a file named MyDrawing.skp, the automatic save creates a file named AutoSave_MyDrawing.skp. The auto-save file is different from the backup file (so while you’re working on a model, you can have three files: the original .skp file, the backup file, and the auto-save file).
The auto-save file is kept until you successfully save your original file. If SketchUp crashes while you’re working on a model the auto-save file is not deleted. You can recover your work from the point the last auto-save was performed. If you’ve never saved your work the auto-save file is stored in a default location specified below:
PC. The file is saved in your “My Documents” folder.
Mac. The file is saved in your user folder › “Library” › “Application Support” › “SketchUp #” › “SketchUp” > "Autosave."
After saving your SketchUp work, the auto-save file will be created in the same location as the original file. [/quote]
As it indicates, there are one of two locations it should be stored when Sketchup crashes, dependent on whether you have saved a first copy or not. I had been saving my work normally prior to the crash, the auto save was supposedly saving successfully, yet I can’t find it in either of those locations.