Copy will not revert to a smaller size.
As far as moving the library, while calibre is closed take the My Documents\Calibre Library folder (or whatever the library is named) and move the WHOLE LIBRARY to some other location using the file manager.
Then open calibre and it will say help I can't find ur library anymore, point to the new location or delete the library from the calibre library list.
Your problem is I am assuming that calibre and Google Drive are trying to access the folder together, and calibre can't keep the database together long enough to move the library, so instead you will move the library manually.
The settings, including the library lists, will remain the same no matter whether you use 32- or 64-bit, and no matter how many times you reinstall. They shouldn't be messed up from Google Drive anyway, just the actual library folder. However, if the library folder doesn't work, then calibre will not know what to do with itself, and send you errors to that effect.
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