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1) It depends on what program / store you are using. Typically, you have to install a program on your computer that downloads your library. For Sony, it's the Reader for PC program. Amazon has Kindle for PC, B&N has Nook for PC, etc. If you buy DRM-free, (ex. O'Reilly tech books) that's not an issue.
2) I think so. Most companies are fine with multiple devices so long as you're using their apps.
3) I think the backup ebook will just be unreadable? If you're backing up all programs and data, then the reader app would be backed up too. If you're talking about just copying the book file to the external hard drive, that will only work if the book is DRM-free.
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