SpiderOak One Backup

SpiderOak One is a zero-knowledge backup and sync tool with a strong security heritage. It performs continuous or scheduled backups of selected folders across unlimited devices, with no file size limits and extensive versioning. It's designed for users who prioritize security and need a true backup with point-in-time recovery, not just sync. Its target is security professionals, journalists, and enterprises.

It scores well for its uncompromising no-knowledge architecture and robust backup capabilities.