with the Kobo for Android app - books do seem to be all stored in a single database, so if that corrupts., or if you need to delete & re-install the app, you lose EVERYTHING
I take your point that on the e-readers, they probably do exist as individual files still, and so are better able to survive a database crash. To be honest, with my epubs, for Aura, I just usb to PC, go to calibre & say send to device, I don't pay any mind to how they are stored once they get there!
Though I read that with kobo store books, the Kobo DRM ties them to a device specific key, meaning that if you cannot copy them to a different Kobo device, even if you set that up with the same credentials - you have to re-download them from Kobo servers.
Amazon do the same, but unlike Amazon, Kobo have been known to de-list books and that then leads to problems like the case that I was reading about recently- you can't download a copy from their store onto your new device if it is no longer in the store!
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