Edit menu > Hold
Hold stores the current scene and its settings in a restorable buffer, which includes all geometry, lights, cameras, viewport configuration, and selection sets.
Use Hold before you undertake an operation that may not work as expected. Use Hold before performing an operation which can not be Undone The Fetch command restores the contents of the Hold buffer, allowing you to get back to a particular point if you need to.
If you use Hold and then you crash, when you restart gmax, you can retrieve your file with Fetch.
See also