What is the best option for free online/cloud data storage or back up?

I'm looking to back up my photos in their current resolution, as well as other personal files. I'd ideally like at least 20gb, possibly 30-50 and would like to keep my own file structure.What is the best option for free online/cloud data storage or back up?
Windows Live SkyDrive gives you 25GB i believe. I never use it much but its a great cloud data storage system. I recommend it.

here is the Link : http://explore.live.com/windows-live-sky鈥?/a>

italian translation to english

mcdonalds monopoly