Originally Posted by Catlady
But I have my converted copy, and a backup of the converted copy. I'm just not seeing the point of also having the original downloaded version on my computer, if it was sold by one of the major bookstores.
Conversions are not 100% reliable - they can and do go wrong - and you may not discover this until you read the book. Perhaps you keep on top of your book pile better than I do, but I have ebooks I bought many years ago that I haven't read yet. I suspect that I no longer have access to most of those at the original stores.
Books are small and essentially cost nothing to store. For me it's a no-brainier to store both the original and any conversions. It's minimising risk.