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if you work on the ARW (Sony Raw file) in lightroom you retain the ability to export as DNG, TIFF or a range of file formats under the

file-export-menu item after developing.

The work done or changes to the original ARW file in lightroom is retained as a XMP file and will be visable in the original ARW

file folder alongside the original ARW file shown as a  blank white icon and the orriginal ARW file name below it.

If you develop your ARW file in lightroom and export as a jpg or other non ARW file format your original ARW file will still be

visable in the original file folder with its XMP file (very small byte/bit size) and you have the option to copy the export file direct to

photoshop for editing and also to your original ARW file folder in the newly exported format.....

Hope this helps to explain the options you have to retain, change and/or export alternative file forms in lightroom....the options to save

your original or export as required are wide and variable and very much open to personal workflow and storage preferences.