SpiderOak One

SpiderOak One is a US-based 'No Knowledge' backup and sync service where all data is encrypted client-side before upload, and the company has zero access to keys or passwords. It emphasizes robust backup features with unlimited version history and deleted file retention. While its interface is more functional than flashy, its commitment to privacy is absolute. It supports multiple devices and is popular with journalists, activists, and security purists.

Pricing is based on storage capacity. It ranks highly for its transparent, uncompromising privacy model and reliable, security-first backup capabilities for individuals and small teams.