How can I stop syning the .lock file?

I back up my cloud services, like google drive and skydrive, to another cloud service with bigger storage. I was amused when I can do it because I now can open files from different cloud services in one place. However, there is one thing annoying me - that is the .lock file from skydrive folder keep syning to that back up cloud service but never succeed, so the syning process keeps running.