As a counter point my experience with Backblaze has been perfect. Been using it since it first came out I think, backs data up relatively fast, and when my drive failed they shipped me a USB drive with all of my data in a day or two (and I believe it came from US > UK so that's pretty impressive). At $5 a month for unlimited I haven't even thought of switching. I believe - although I could be wrong - they also encrypt the dat and give you the option of managing the keys so they don't have access.