Now I use spideroak. I pay 120$ a year for unlimited zero-knowledge encrypted storage. Currently using 9 TB. :)
I can't see that plan here: https://spideroak.com/one/ $279 for 5TB seems to be the top of the range. I do hope that zero knowledge is not simply a prescient comment on your future data availability.
Also, why is this needed for a zero knowledge data storage silo: https://spideroak.com/dmca-takedown-notice-submission/ ?