Any DRMd book I buy goes into the folder called 'Locked' after I've downloaded it through Adobe. A copy without DRM is then made in the folder called 'Unlocked'. Said title then wanders into the 'Base Library' folder where I do any desired editing in Sigil (or any necessary corrections, dammit!). The 'Base Library' folder is the source used by Calibre to add to the Calibre library. Obviously there's a useful degree of backup given that different disk drives are involved.
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