Document.AutoSaveOn (Word)

True if the edits in the document are automatically saved.

When a new document is created, the default value for the AutoSaveOn property is False, the property is disabled, and the user's changes will need to be saved manually. However, if the document is hosted on the cloud (that is, OneDrive, OneDrive for Business, or SharePoint Online), then the AutoSaveOn property defaults to True and the edits in the specified document are automatically saved. If a cloud-hosted document is shared with other users, then their changes will also be automatically merged into the user's local copy when AutoSaveOn is True. Table 1 AutoSaveOn behavior

Sub UseAutoSaveOn()
    MsgBox "This document is being saved automatically: " & ActiveDocument.AutoSaveOn
End Sub