The scanned image of the document allows but does not imply long-term storage. But still, in most cases, the image should be stored no less than the paper original, and often much longer, because its significance and importance in the context of the organization-owner are always kept above the zero marks. In addition, the image is taken from a paper document, which means that its change is not implied, although it is possible. In case of the Word to PDF conversion, this is important.
Based on the listed features that a scanned image of a document possesses, we can safely say that both formats are equally suitable since for each specific document the format capabilities that are not supported by the PDF / A standard will not be used. The latter allows both metadata and the text layer on top of the image, and even the signing of the document in order to protect it from modification. And the need to introduce fonts in each document can be neglected: since we are talking about images and there is no text, respectively, there are no fonts, and the additional weight in this regard will be small.
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