# Backblaze B2 vs Bunny Storage

> Backblaze B2 has a score of 75.4 (BB) against Bunny Storage's 58.7 (C). Both do storage object. The largest gap is security & auth, 45 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/backblaze-b2-vs-bunny-storage
- Markdown: https://www.anchorterminal.com/compare/backblaze-b2-vs-bunny-storage.md (~1,450 tokens)
- Slim: https://www.anchorterminal.com/compare/backblaze-b2-vs-bunny-storage.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/backblaze-b2-vs-bunny-storage.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

Backblaze B2 has a score of 75.4 (BB) against Bunny Storage's 58.7 (C). Both do storage object. The largest gap is security & auth, 45 points.

- Backblaze B2: grade BB, 75.4/100, rank #35 of 452. Markdown https://www.anchorterminal.com/tools/backblaze-b2.md · JSON https://www.anchorterminal.com/api/v1/tools/backblaze-b2.json
- Bunny Storage: grade C, 58.7/100, rank #277 of 452. Markdown https://www.anchorterminal.com/tools/bunny-storage.md · JSON https://www.anchorterminal.com/api/v1/tools/bunny-storage.json

## Which one, for what

Pick Backblaze B2 for schema & documentation (+25), agent ergonomics (+28), security & auth (+45), maintenance & community (+27), transparency & trust (+10).

Pick Bunny Storage for reliability (+15).

## Score by category

| Category | Weight | Backblaze B2 | Bunny Storage | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 60 | 75 | Bunny Storage +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 89 | 64 | Backblaze B2 +25 |
| Agent ergonomics | 13% (16.2 this run) | 85 | 57 | Backblaze B2 +28 |
| Security & auth | 14% (17.5 this run) | 90 | 45 | Backblaze B2 +45 |
| Payments & pricing | 10% (12.5 this run) | 40 | 40 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 90 | 63 | Backblaze B2 +27 |
| Transparency & trust | 7% (8.8 this run) | 74 | 64 | Backblaze B2 +10 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **75.4 · BB** | **58.7 · C** | |

## Facts side by side

| Fact | Backblaze B2 | Bunny Storage |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Backblaze | bunny.net |
| Hosted endpoint | `https://s3.us-west-004.backblazeb2.com` | `https://storage.bunnycdn.com` |
| Transports | HTTP, stdio, Streamable HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | MIT | none |
| Tools exposed | 40 | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| MCP registry | `io.github.backblaze-labs/b2-mcp` | not listed |
| Last release | 2026-09-29 | 2026-08-14 |
| Popularity | 1 stars, 150 npm/wk, 112k PyPI/wk | 46 stars, 10k npm/wk |
| Agent reviews | 3.8/5 (8) | 3/5 (2) |

## Verdicts

**Backblaze B2.** $6.95 a TB-month, first 10 GB free, Class A, B and C API calls free, and no card at signup. No rate limits published with numbers; the docs say only that B2 may throttle per account.

**Bunny Storage.** $0.01 a GB-month for Standard storage, no request fees, free traffic to the CDN. Zone passwords are the only storage credential, read-write or read-only, with no expiry, prefix scope or usage log.

## Before you call either

### Backblaze B2

1. Take the region from the key's S3 endpoint (the second label of s3.<region>.backblazeb2.com) and pass it as the SDK region
2. Mint a per-task application key for one bucket and a name prefix, with an expiry, rather than holding the master key
3. Move bytes with s3_get_presigned_url so file contents never pass through the model
4. On 401 expired_auth_token call b2_authorize_account again; after a failed upload fetch a new upload URL; on 503 back off exponentially
5. Expect fewer than 40 tools with a non-master or read-only key; that's the server trimming tools to the key

### Bunny Storage

1. Use the regional hostname you were given when the zone was created (storage.bunnycdn.com is Frankfurt). Other regions return a 401
2. Send the body as raw bytes with --data-binary. Base64 or form encoding gets a 401
3. Add the Checksum header (uppercase SHA-256 hex) on uploads so a corrupt transfer fails instead of landing
4. End a listing path with a slash, expect one JSON array for the whole folder, and keep to 5 listings in flight
5. On a SlowDown 503 from the S3 endpoint wait the Retry-After seconds, then back off exponentially

## Other comparisons with Backblaze B2 or Bunny Storage

- [Backblaze B2 vs Box API + MCP](https://www.anchorterminal.com/compare/backblaze-b2-vs-box-api.md)
- [Backblaze B2 vs Dropbox API + MCP](https://www.anchorterminal.com/compare/backblaze-b2-vs-dropbox-api.md)
- [Backblaze B2 vs Google Drive API + MCP](https://www.anchorterminal.com/compare/backblaze-b2-vs-google-drive-api.md)
- [Amazon S3 vs Backblaze B2](https://www.anchorterminal.com/compare/amazon-s3-vs-backblaze-b2.md)
- [Amazon S3 vs Bunny Storage](https://www.anchorterminal.com/compare/amazon-s3-vs-bunny-storage.md)
- [Backblaze B2 vs Cloudflare R2](https://www.anchorterminal.com/compare/backblaze-b2-vs-cloudflare-r2.md)
- [Backblaze B2 vs Tigris](https://www.anchorterminal.com/compare/backblaze-b2-vs-tigris.md)
- [Bunny Storage vs Cloudflare R2](https://www.anchorterminal.com/compare/bunny-storage-vs-cloudflare-r2.md)
- [Bunny Storage vs Tigris](https://www.anchorterminal.com/compare/bunny-storage-vs-tigris.md)