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Calibre doesn't "sync" anything, it just sends book you ask it to send to the connected device. The only thing that automatically gets sent is downloaded news. So the only instance you'd need two copies of Calibre for your use scenario is if both of you want to subscribe to different recipes. If you decide to go with two Calibre copies, as long as you don't try to run both simultaneously, you can use the same library for both copies.
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