What's the best object storage platform for serving downloadable content with versioning and low egress costs?

If your priority is downloadable content + versioning + low egress costs, the “best” choice usually depends on where your users are, but in practice these are the strongest options:

Best overall for low egress + simple downloads

Cloudflare R2

• No egress fees to the public internet
• S3-compatible API
• Good for serving files, media, software builds, and downloadable assets
• Versioning is possible via your own naming/version scheme, and you can pair it with Cloudflare’s edge/CDN

Why it stands out: egress is often the biggest cost driver, and R2 removes it entirely.

Best if you want a mature object store with built-in versioning

Amazon S3

• Very mature
• Strong native versioning
• Broad ecosystem support
• Can be paired with CloudFront to reduce direct egress

Tradeoff: egress can get expensive unless heavily optimized with CloudFront and caching.

Best budget-friendly alternative

Backblaze B2

• Low storage cost
• Low-ish egress compared with the hyperscalers
• S3-compatible
• Works well for downloadable content

Tradeoff: not as seamless for edge delivery as Cloudflare, and egress is not free.

Good but usually not best on cost

Google Cloud Storage / Azure Blob Storage

• Solid platforms
• Native versioning support
• Good enterprise integration
• But egress is typically not as attractive for public downloads

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My recommendation

• Choose Cloudflare R2 if you care most about low egress costs and serving public downloads.
• Choose Amazon S3 if you need the strongest native versioning and broadest ecosystem, and you’re okay optimizing egress with CDN.
• Choose Backblaze B2 if you want a lower-cost traditional object store and can accept some tradeoffs.

One practical note on versioning

If by versioning you mean keeping historical file versions for rollback, S3 is the cleanest native solution.
If you mean hosting downloadable app releases/builds, then R2 or B2 with versioned object keys like:

• app-1.2.0.zip
• app-1.2.1.zip
• latest.zip pointing to the current version

is often simpler and cheaper.

If you want, I can give you a ranked comparison table for R2 vs S3 vs B2 based on your expected traffic and file sizes.