How secure is 'Cloud Storage'?

Let's ask https://www.google.com/#q=wozniak+on+cloud
That's not good.

Let's see what happens if you secure your stuff like Lavabit.
https://en.wikipedia.org/wiki/Lavabit
Again, the result was not good.

I think that makes it clear that the Cloud is about ease of use and not security.

As to item 2, that's news to me. I found nothing on the web that said 10 blocked such.

There are some tin foil vendors that want to sell you their product. Ed Bott writes about at:
http://www.zdnet.com/article/no-microsoft-is-not-spying-on-you-with-windows-10/

If you are worried about security, I'm sure like my you have Tails the OS handy. I use that when on travel when I can.

Granted that if my house burns down or some thief breaks in and steals the backup drive, I might lose some data. However I keep my most critical data in 4 places. One on my main desktop, two on external hard drives, and one on a flash drive I keep locked in my car (which has a security system). Some claim they need the cloud for portability, but you can put 128 GB on a flash drive that you can buy for under $30 these days. Some talk about shared projects, but if you have to share data for development projects on a day by day basis, you just haven't designed your project well.
I have a cousin who was using the cloud for backup when his hard drive went out. He had to do without his PC for the better part of a week, had many problems getting all his data back, and it took a couple of weeks to get things back close to normal. This guy is a PhD engineer FWIW. By way of contrast, I had my main hard drive go out back in July. A 30 min. trip to get a replacement drive plus an hour to replace the failed one and do a full system restore, and I was back to normal with nothing lost and everything working just fine. It seems like a no brainer to me.