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That challenge is the greatest we face where I work with our CAD files, the medium of storage and the format itself. We have products still made today that date back to the 1960's. So the very media of storage is a challenge over the years.
Right now I have a temp working to scan all our paper-only documents (drawings, blueprints, brownlines). We estimate it as a three man-year project but the results will fit on one large modern hard drive. Formats chosen, right now, are PDF (wrappers for JPEG) and TIFF. I don't know what we'll do when PDF and TIFF viewers begin to obsolete!
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