Having it in the cloud provides a level of redundancy you just can't replicate locally. For if the cloud services company does it right, your data is scattered across multiple servers in different geographical locations. So even if one of their data centers gets destroyed, they will still be able to reconstruct your data set from the other data centers.
I have gigabytes of photos, music recordings and documents that I would never be able to recreate so I want to cover all the bases. As far as NSA, Google, etc., having access to my personal data, I guess I'm not that concerned. They will be bored to tears looking at my vacation pictures and reading my amateur attempts to be a short story writer.
I agree in principle......I too did not have concerns some 6 years ago, but I think the situation has changed.