You could also try using copy.com to sync your library to cloud. You would just create a shortcut to your regular library folder in the copy.com folder, it would sync to the cloud and would then sync and be accessible on laptop.
I do this with a portion of my library and so far so good.
Copy.com comes with 15gb free on sign up and you could use this referral
link to get 5 more (full disclosure, I would get 5 more too).
And I use the portable/usb calibre on my second computer(s) too.love it