You can save versions of your scene using 
		Increment & Save (File > Increment & Save). 
	 
To save versions of a file
- Select 
		  File > Increment & Save. 
		  
Tip:  
			 - (Windows) You can also use the hotkey Ctrl + Alt + S. 
				
 
- (Mac OS X) Use the hotkey Command + Alt + S. 
				
 
 
		   
 
		  Maya creates a new version of the file and saves it to the same directory as the original file. By default, the new version is named 
			 <filename>.0001.m. File names are incremented by 1 each time you create a new version. 
		  
 
		  After saving, the original file closes, and the new version becomes the current file. 
		  
 
		 
Note:  
		  - If the original file has never been saved, selecting 
				File > Increment & Save 
				opens the 
				Save As window. 
			 
 
- If the original file has a number appended to its name, the new file name respects this format. For example, if the original file name is 
				<filename>.01.mb, the next name is 
				<filename>.02.mb.