Backblaze B2
Low-cost cloud object storage with native B2 API and S3-compatible API, offering 1/4 the cost of AWS S3 for storing and retrieving files, with CDN integration options.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
SOC2 certified. Bucket-scoped application keys. Server-side encryption optional. No FedRAMP or HIPAA. Simpler security profile than AWS S3 but adequate for most use cases.
⚡ Reliability
Best When
Cost is the primary concern and you need simple, reliable object storage with S3 compatibility.
Avoid When
You need sub-10ms latency, advanced S3 features, or strict compliance requirements beyond SOC2.
Use Cases
- • Low-cost storage for agent-generated files, images, and data
- • Backup and archival storage for agent workflows
- • S3-compatible storage for teams migrating from AWS at lower cost
- • CDN origin storage via Cloudflare integration (free egress)
- • Large file storage for AI training datasets
Not For
- • Real-time latency-sensitive storage (S3 or GCS are faster)
- • Complex versioning or lifecycle policies at enterprise scale
- • Regulatory compliance requiring US-only FedRAMP storage
Interface
Authentication
Application keys with bucket-level scoping. Master key for account-level operations. Separate keys per bucket recommended.
Pricing
Agent Metadata
Known Gotchas
- ⚠ Two APIs (native B2 and S3-compatible) - pick one and stick with it
- ⚠ Native B2 API creates new file versions on upload - old versions accumulate cost
- ⚠ Authorization tokens expire - must reauthenticate periodically
- ⚠ Download URLs can be public or private with presigned URL generation
- ⚠ S3-compatible API requires endpoint override to B2's S3-compatible endpoint
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Backblaze B2.
Scores are editorial opinions as of 2026-03-06.