SpiderOak review (2026): verdict, pros & cons

Long-standing zero-knowledge (No Knowledge) backup and sync where files are encrypted on-device before upload.

This review trims SpiderOak down to the essentials: its strengths, its trade-offs and the buyer it really suits.

Verdict: SpiderOak is built around zero-knowledge-backup, and that focus shows. Our editorial rating is 4.4/5 — an editorial assessment from sourced research and feature comparison, not an average of user reviews.

Who SpiderOak is for

SpiderOak makes the most sense for zero-knowledge-backup and privacy. If that matches how you'll use it, value comes quickly; if your needs sit outside that core, a more focused or cheaper tool may serve you better.

Notable features

A few capabilities do the heavy lifting in SpiderOak:

• 'No Knowledge' (zero-knowledge) encryption: files encrypted on-device before upload
• 2048-bit RSA and 256-bit AES encryption
• Backup, sync and share in one client
• Unlimited devices on all plans
• Historical file versioning

A pioneer of 'No Knowledge' zero-knowledge backup where everything is encrypted on-device first.

Pros & cons

Strengths

• + Strong, long-established zero-knowledge ('No Knowledge') encryption
• + Unlimited devices on every plan
• + Files encrypted before leaving your device, even SpiderOak cannot read them

Where it falls short

• - Slow upload/download speeds reported in reviews
• - High price relative to storage and a sparse feature set
• - No public affiliate program found at time of research

Pricing: ~$6/mo 150GB up to ~$29/mo 5TB (One Backup); pricing varies by plan · full pricing breakdown →

Bottom line

Our take: SpiderOak is worth shortlisting for zero-knowledge-backup and less compelling if that is only a side concern; paid plans start around $6/mo, so validate fit on your own workflow first.

Full SpiderOak overview →