Some thoughts …
While I do not have silverfast, I would always store the raw data including the IR channel and not the corrected image, as you may discover flaws of the correction later and without the original data it will be hard to discover or fix.
E.g., the VueScan inpainting is much less efficient for particular scratches than other solutions, here is the VueScan result and here a comparison of different inpainting methods from G’MIC for exactly the same scratches/dust spots.