How to unblock Dropbox/Skydrive blocked in China?

I plan to use the cloud-based service for storing my photos during the trip. I figure Mongolia would be fine in this respect, and I know it's impossible in the DPRK, but since I don't expect crime in the DPRK so it would be fine. However, I'm not so sure about China. Even I traveled there 2 years ago and felt perfectly safe, but still I don't want to risk losing precious photos during the trip. Now I'm using dropbox and skydrive, and I wonder if these two sites are blocked in China (I know GoogleDrive is blocked)? Also, I'm wondering if Skype is blocked there as well??

I have a bit of question about VPN though. I'm studying at a US university, thus have a complimentary access to its VPN. I used it in China 2 years ago. I found no problem at a hotel in Shanghai and at Beijing airport, where the internet connections are fast. However, when I stayed in a hostel, where the internet connection can be slow, I can't really open facebook or youtube through VPN at all. I'm not sure if you have experienced similar problems? Are there any "faster" VPN, or am I better off going to the internet cafes in this regard?

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