Syncing an ereader is about keeping your place within the book when changing devices. It doesn't usually refer to putting all your books on a device.
I sync Moon+ with Dropbox because I read on a couple of different devices and it always remembers my place when I switch. I can do the same thing with Google drive.
I also store books on Dropbox and Google drive so they're available to me but I just download a book or two now and then. I don't try to keep all my books on the device. It just has the book I'm reading now and a few I'm thinking of reading next.
Barry
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