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maddz - If you had a Reading List or a Virtual Library for Nexus Only, and a NexusOnly folder somewhere, then you could use the Connect and Send to folder facility, it would give you a 'virtual device' that you would replicate to Google Drive.
Why mention a Reading List, because you can add books to a RL arbitrarily, whereas a VL has to have a rule in the form of a search. Which would suit best, depends on volumes, volatility and your way of working. The
Reading List PI (
← click) is device aware.
If you use the Connect and Send To a Google Drive replicated folder approach then it will result in having two copies of the big PDF's on your computer, one in the calibre library folder, and another in the NexusOnly folder... think of it as an extra backup
BR