This is a workaround that I've found. This is, by no means, any official thing and I recommend you use it at your own risk.
I have, in fact, suffered data loss from using Google Drive, though I've managed to fix it (one of my devices was offline and the library intact there).
Do not ever have multiple copies of your GDrive running when your library is updating to prevent corruption.
1. Turn sync off your PC.
2. Do whatever you want with your library.
3. Turn off sync on every other device you own, or turn off their internet.
4. Turn on sync on your PC.
5. When the update is finished, turn off sync on your PC again.
6. Sync every other location one by one, while every other device's sync turned off.
Since I only have two devices where I sync my books library (desktop and laptop) this is not a problem for me, since I always update in bulk.
Once again, I'm reiterating,
use this at your own risk. I'm using it with a full knowledge of the possibility of data loss and my own responsibility is only for my data loss.
Also, I run out of space on dropbox.
