I have a collection of several thousand ebooks ( 10 GB+) and I keep them only on memory card. And I use two cards - one card for science fiction, the other for the rest. My main memory is empty.
When I copy books over I find it easier just to use an SD card reader to copy them, instead of plugging the ereader in via usb.
To manage the files I use folders (with PRS+)
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