I have an iPad Air and an amazon kindle. I get kindle magazines which I can read on my ipad with a kindle app. Last time I updated my iOS it wiped away all the downloaded files in my kindle app. How do I back-up these kindle magazines? Can I do it to the iCloud? I need a back-up because the amazon cloud only keeps magazines in it for 7 months. Note I can't just plug my kindle in and copy the files directly because I believe it uses a different format file than my iPad. On monochrome kindle the magazines are .azw but on IPad I believe they are full color .kF8 files. Thanks for any help/comments/suggestions in advance.