I work online as an EFL teacher, that is English as a Foreign Language. I'm not going to name the site for which I work, for obvious security reasons.
Yesterday, the site was inaccessible all day long because some asshole(s) were DDoS attacking it. Now, what sort of antisocial wankstain wastes his/her time carrying out a DDoS attack on a language-tutoring website? I am at an utter loss to explain such behaviour, but it was happening, and it cost me a full day's income.
Personally, I don't use any cloud services at all. I won't even allow Steam, (not to be confused with Steem), to store my savegames to its cloud, and that requires actively opting-out, since such cloud saves are enabled by default. And my reason is exactly what you have cited - security.
In the immortal words of Tycho Brahe, (the Penny Arcade guy, not the astronomer), "every avenue of convenience for the user is also a potential vector of attack". This is true because Convenience and Security are opposite ends of a sliding scale. The more convenient something is, the less secure it is, and vice versa.
And so, forgive me please, but I'm skeptical about this Cryptyk platform you are promoting here. The last four paragraphs of your article sound suspiciously like something from somebody's marketing department, full of empty verbiage and unsubstantiated claims.
I have a NAS in my house that I haven't used in years, so it is too far out of date to use again.
In the near future I will be buying and setting up another one. It includes hardware encryption as well. For the last 10 years I've been trusting my data with Google Drive, but I don't trust them anymore and worry about losing access one day. The Synology device I end up buying will automatically back up one way or both ways with Google Drive, DropBox, and Amazon too!
I'm sorry to hear about the DDoS attack against your work website. Such attacks are one reason why I like the Steemit blockchain concept. So many different sites connect to it that you'd have to DDoS or block them all on the DNS level to really shut it down completely. Hopefully governments or hackers would never do that though.
Cryptyk isn't a cloud service provider; it's a security service.
Consider that while you opt out of Steam's cloud storage, the system itself runs on it. In fact, its throughput relay utilizes it too. While you can opt out of some vectors that require cloud service, you cannot opt out of all of them. In many cases, the platform itself relies on the cloud service.
Shunning convenience isn't a good thing or we'd still be on horse buggies. The goal is to adopt the convenience in a secure manner. So, any service that secures the cloud is taking the right step forward.