Keeping different versions of a Word document in the same file
Microsoft Word calls this operation "versioning".
The principle is very simple: one file will contain all the versions and will increase the file size. You can also extract any version and save it as a separate file/document.
To use the version options:
1. Choose "Versions" from the File menu;
2. Click the "Save Now" button to save the current state of the document. Word then
3. To keep a particular version, use the Save As command on the File menu.