Does ACR save JPEG & TIFF files like RAW files are saved?

I know ACR saves RAW file edits to side-car files, not permanently changing the original file. Does ACR do the same for JPEG and TIFF files when they are opened, edited and saved? Thanks.

I wonder if Kelby could have been confused by the fact that the metadata describing the Camera Raw settings is being stored back into the JPEG file.  The key is that the JPEG file is indeed re-written, but the actual image data is not changed.
Here's an experiment you can try for yourself:
1.  Start Photoshop, and choose File - Open As...
2.  Change the type to Camera Raw, and choose a JPEG file that you have on your disk, and press [Open].
3.  When Camera Raw comes up, push the Exposure control all the way to -4.00 EV and press [Open Image].
4.  Note that it's very dark, as expected.
5.  Close the document, do not save.
6.  Note that the JPEG file has been updated on your disk by seeing that its date and time are current.
7.  Choose File - Open As... again and open the same JPEG file.
8.  Note that the Exposure control is set again to -4.00 EV and the preview is very dark.
9.  [Cancel] the Camera Raw dialog.
10.  Open the same JPEG file from Windows Explorer using the Windows Photo Viewer.  Note that it is NOT dark.  The original JPEG data is still intact, as bright as it ever was.
-Noel

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