True if Word saves only changes to a document. When reopening the document, Word uses the saved changes to reconstruct the document. Read/write Boolean.
Remarks
The AllowFastSave and CreateBackup properties cannot be set to True concurrently.
Example
This example sets Word to save the complete document, and then it saves the active document.
Options.AllowFastSave = False
ActiveDocument.Save
This example returns the current status of the Allow fast saves option on the Save tab in the Options dialog box.
Dim blnFastSave as Boolean
blnFastSave = Options.AllowFastSave