Cloud computing on netbooks — Why?

All this talk about Google's Chrome OS has made me think a bit.

While in general I agree with both Dion Moult and Christian Weilbach and am in general mistrusting to cloud computing (at least in its currently most popular form), there is something else that bothers me with this hype.

As of late a lot of talk and effort about cloud computing was being done in the direction of making it work on netbooks and similar mobile devices. To me this makes no sense! Having your documents and data online is a great idea if you have no computer of your own or you have to migrate a lot, but only have a stationary system.

But if you can take all your data with yourself on a ultra-portable device with hours of autonomy time (e.g. netbook, smartphone), why would you rather have it online out of your direct reach?

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