iPad Backup
Why do I get the following when trying to backup my iPad?
iTunes could not backup the iPad because the iPad disconnected.
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The explanation would appear to be in the message: because the iPad disconnected from your iTunes Library.
Check the cable you're using to connect the iPad to iTunes. Is it damaged? If so, perhaps a wire that keeps disconnecting is the cause of the problem. If you're using a Wi-Fi Sync, then perhaps your Wi-Fi signal isn't strong enough.