ubuntu one vs skydrive

I've tried u1 and I love it. Especially the way how folder backup works. It is backuping all the changes to u1. The choosen folders look exactly the same as on the cloud. If I delete a file in the source the file is deleted in the target.. I think its called a mirror backup. Anyway... I choose sky drive because of the prize.
So two questions.
1. Are there any similar backup to skydive? 3rd party sowtware is OK.
2. Does skydive has any stream limit /month?

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