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Let's say that while you love the idea of cloud storage, the thought of having your data naked out there somewhere on the cloud gives you the heebie-jeebies. In that case, be sure to check out SpiderOak.
Long before most people were worrying about the NSA, SpiderOak set up a cloud storage system where even they can't see what files you have in their systems or their associated metadata. Indeed, in its "zero knowledge" design they don't even see your password or encryption keys. Oh, and did I mention that your files must be encrypted? If privacy is what you want, then SpiderOak is for you.
Individual accounts start with 2 GB of free storage. Upgrades come in 100 GB increments, and cost $10 a month or $100 a year. The SpiderOak Blue business service starts at $600 a month, with a terabyte of storage for up to 100 users.
I can't tell you what the perfect cloud storage is because there's no such thing. It all depends on your needs. If you want ease of use, it's hard to beat Dropbox. If you want to combine cloud storage with workflow management, then Box is for you. Love Windows, then you'll love OneDrive. If you want just the basics, then Android Cloud Drive might be good enough for you. If security is the be-all and end-all for you then go straight to SpiderOak. And finally, if you want the most storage for the least amount of money or you're already using Google for most of your work, then Google Drive will be your first choice.
Me? I've used all of them at one time or the other and I've found them all useful. I'm sure you'll find one of these that fits your needs to a T.