Backblaze vs Cdnjs

What Backblaze is

Backblaze sells distinct products, most notably B2 Cloud Storage and Computer Backup. B2 is usage-billed always-hot object storage with Native and S3-compatible APIs, browser access and command-line tooling. Current public pricing starts with 10 GB free, then meters byte-hour storage, egress beyond an allowance and selected Class D transactions. Encryption, Object Lock, version history and replication are capabilities to configure—not substitutes for independent access controls and tested recovery.

What Cdnjs is

cdnjs is a free, community-run CDN for open-source web-library assets, delivered through Cloudflare. Consumers select a library, exact version and file, then reference its public URL; the service also exposes library metadata through an API. Example markup published by Cloudflare uses a versioned URL and Subresource Integrity attributes. cdnjs' code repository is MIT-licensed, but each distributed library keeps its own license. It is a dependency-delivery service rather than private storage, a package-security review or a contractual availability guarantee.

What Backblaze is built to do

S3-compatible API

Supports common S3 operations alongside Backblaze's Native API.

Usage-based storage

Bills stored bytes over time with separate egress and selected transaction rules.

Object immutability

Object Lock and Legal Hold can prevent deletion or change for governed retention periods.

Encryption and replication

Offers managed-key or customer-key SSE and configurable bucket replication.

What Cdnjs is built to do

Library catalog

Indexes versioned files from supported open-source JavaScript and CSS libraries.

Cloudflare delivery

Serves cached public assets through Cloudflare's network.

API access

Exposes library, version and file metadata for discovery and tooling.

Integrity-ready snippets

Provides examples and hashes that can be used with browser SRI and crossorigin attributes.

Choose Backblaze if

• Backup repositories whose software has verified B2 or S3-compatible support
• Media and application objects with modeled storage, download and transaction patterns
• Immutable off-site copies configured with restricted keys, Object Lock and restore drills

Skip Backblaze if

• The workload depends on an untested Amazon S3 feature or exact behavioral parity
• Required data residency, region pairing or recovery throughput is not available and verified
• No owner exists for key rotation, retention, lifecycle, replication and restore testing

Choose Cdnjs if

• Static sites loading a well-known public library at an exact reviewed version
• Documentation and prototypes where a third-party CDN is permitted
• Teams that enforce CSP, verify SRI hashes and retain a self-hosted fallback for critical assets

Skip Cdnjs if

• Assets are private, proprietary or outside the cdnjs library catalog
• Policy forbids third-party asset requests or requires a contractual SLA
• The team cannot review the package license and code or pin an immutable version

Backblaze: pros & cons

• Low-friction object storage: Native and S3-compatible APIs work with many existing backup and application tools.
• Published usage model: Storage, egress allowance, overage and transaction classes are documented publicly.
• Data-protection controls: Optional server-side encryption, Object Lock, version history and bucket replication support resilient designs.
• Egress options: Downloads are free up to three times average monthly storage and through named CDN/compute partners.
• Not all S3 behavior is identical: Compatibility must be checked against the exact SDK, operation and application workflow.
• Encryption is a configuration decision: Official documentation says B2 data is not encrypted by default and offers optional SSE.
• Recovery cost can vary: Large restores may exceed free egress and generate transaction, network and operational costs.
• Product confusion risk: Computer Backup retention and device rules do not describe generic B2 object storage.

Cdnjs: pros & cons

• No-cost public delivery: Supported open-source library assets are served globally through Cloudflare.
• Versioned paths: URLs can identify an exact library release and file for reproducible front-end loading.
• Integrity metadata: Published examples support browser Subresource Integrity checks when the correct hash is used.
• Open project and API: Public repositories and metadata endpoints make the catalog inspectable and automatable.
• Catalog scope is narrow: It is not private asset storage or a general-purpose origin/CDN product.
• Package trust remains external: CDN availability does not prove that a library release or transitive code is safe.
• Third-party dependency: Page delivery, privacy posture and CSP must account for requests to an external domain.
• Licenses vary: The cdnjs repository license does not replace the license of each hosted library.