I don't think most of us worry about this as much as you do, polli. When I download a book with ADE DRM, I click on the acsm link and the book opens in Adobe ADE and automatically goes into the My Digital Editions folder ADE creates in My Documents. I then open Calibre, and import the book into Calibre from the ADE directory if I want some Calibre magic on that book. Both folders are backed up like any other folder as part of my automated routine.
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