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Having another drive in the system worries me with respect to viruses.It seems one could get a virus and transport it to the backup drive and risk losing the backup.
So, how many people read this thread and promptly started a backup??
I have always just plugged my wife's iPad into a USB cable to the PC. Then just use file explorer to move the files. They look just like any external memory stick and you should see them all. Skip using any PC application that may have its own idea of what to move.