I read somewhere about it, and there people had the same worries. But there were some ideas too: like if I want to play a really PC killer game on an older PC too, than the server can make all the background computing for me, and I can play HALO 45 on a P3 :D. BUT! What's with the internet speed. By us (Hungary) the most download speeds are OK (1024k, 2048k, 4096k,...etc), but it will die by the upload speed (with a 4MB down you get 256k up.... :S). And I think if we wanna do anything with cloud computing we need better internet speeds. (I don't know how it's in other countries, but think it's almost the same.) So first of all better netspeed, than we can think about clouds...
The other one people talked about is using ie. MS Word 2346 (:D :D) by Clouds... I think some apps doesn't need this tech, like Office apps.... They are not so havy... I think when you want to use this tech, you want to use it with pc killing apps (premier pro, 3d apps, games, cads).
By the data protection I think it's always better if you have a pendrive (USB-stick, or how it's in eng :P :D), and you will have all the data with you which are imprtant at the moment... OK storing it on a webserver is more easier, but not everywhere is internet...
I think this technology should to use for make people's computers more compativble to use the really havy apps too. I mean sometimes it's enough for the pc (older ones, which are mostly in the business sector) to run the OS (like Vista), and the other softwares just kill it, and slows really much your work....



ps: I hope I was clera enoug :P I'm a little bit tired at the moment :D :D :D