Many of the Kobo books can be purchased in epub form, then downloaded to ADE instead of the Kobo. They will be kept in your ADE library as encrypted files which can be backed up anywhere. And then, if you search around, you can find out how to strip the DRM so you can read your files on any epub reader.
Oh yes, to download the epubs, you go to the Kobo store with your browser, not the Desktop App; and you have to have Adobe Digital Editions installed first.
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