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I never intended to suggest relying on cloud instead of backups. Just that checking your cloud records is a quick way of establishing your original purchased format. i.e. if it's in your amazon cloud then the original format was not epub.- if not , then it was epub ( unless you also shopped at some other mobi format seller).
e.g. I have a few .mobi format from humble bundle but there's a complete purchases history in my account there, so it's easy to check that.
Unless you have dozens of shopping accounts to check , it''s a quick solution to "what format is the original".
I add an "amazon" tag to any book from amazon that I place in calibre - that's even quicker
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