Backblaze.com, see my post above.
YT,
I concur. Backblaze will give you peace of mind concerning off-site storage. It is completely transparent, just working away in the background. 15¢ a day.
I recently had cause to contact their help desk and I was really impressed. A rapid response with detailed specific instructions relating to the configuration issue I was having. None of the flowery language, full of fake empathy that I get from other vendors - Apple, I'm looking at you!