ive been using Amazon Cloud Drive
https://www.amazon.com/clouddrive/home for many months. its 59.99USD a year for "Unlimited Everything" and you get 100TB of Amazon S3 space. its basically a poor man's S3 though, because you dont get all the fancy S3 tools. Its really just a place to store archives, even though there is an API and people have made apps to try and turn the 100TB into a sync service. i recommend using rclone with it
https://github.com/ncw/rclone