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First off there are always at least three, and sometimes more separate copies of each book on my main computer. If I have purchased a ebook from Sony, Amazon, etc. the original in what ever format is in the original download folder. A copy of every file from whatever source is in a directory organized into fiction and non-fiction with sub-directories for each author. Here is a copy of the original file from whatever source, a copy with DRM stripped (if applicable), and a file converted to epub (if original format was other). All the epub format files here are than duplicated again in my Calibre folder. My main computer is set up with RAID 1 so that I have enough confidence in my data integrity that I figure a once a week backup to an external USB hard drive is good enough.
I don't trust the cloud services to be reliable and always available to be willing to pay for one, and the free services do not provide enough space.
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