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Message: <blockquote data-quote="Dave_W" data-source="post: 95087" data-attributes="member: 9521">A TIFF file contains all your EXIF data, too, only it is a much larger format file due to the nature of its code and the amount of information stored in it. To be sure, LR never alters your DNG/NEF files in any way and hence there are no "save" buttons in LR, your RAW data files exist as a permanent record of all the raw data that was received from the camera. When you do make changes to an image, be it a DNG or NEF file, those changes exist only in the LR catalogue file that is associated with that particular image and not written to the image file itself. But this is not the case with TIFF files, they contain all the PP data and thus produce a much larger file.Does this make sense?</blockquote>