And as I said previously...
It is not about the merits of cloud storage. The OP asked how to know original format and I said, one possible simple check is look at your amazon account my content. If it is not there then you bought epub from some other store.
The issue that amazon may delete accounts or books 0.00001 % of the time is not relevant to using them to check for purchased formats.
Next time, I will not bother to comment, meanwhile do try to stay on topic
PS For speed, I just go to calibre - find book - open path - view file create date and time for each format in the pop +time up windows explorer window. earliest date = original format. that method probably does not work if you go moving stuff between libraries or transferring libraries to other devices though
Last edited by stumped; 09-16-2016 at 03:49 AM.
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