Zero Knowledge cloud-based backup solutions
Ranked in these QuestionsQuestion Ranking
Pro Available for many platforms
The Spideroak client is available for Linux, MacOS, Windows, Android and iOS.
Pro Zero knowledge
Data is locally encrypted before uploading to Spideroak. They cannot recover your data even if they wanted to since it is stored in encrypted state on their servers.
SpiderOak updates only that part of the file that has changed, saving bandwidth and time.
Pro Combines cloud syncing, storage service and backup client
Thus you have a single service for all of the things.