1. It's not a question of costs but of reasoning. Maybe for some functionality additional copy will be needed in the future. So (maybe) I should "get over" triple wastage of disk-space? Please, let leave "Calibre" where it is. It does wonderful job where it supposed to, but please do not force it where it doesn’t belong.
2. Mine library (as many others) is located on mobile hard disk, hence I'd like to leave it where it is.
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