Best S3-Compatible Object Storage Providers to Try for your Startup

Cloudflare R2 is worth testing first if your product serves files to lots of people. Cloudflare does not charge for egress, the data leaving storage when someone downloads a file. On S3-style services, that line item often surprises founders once traffic grows.

The tradeoff is operations: R2 charges separate rates for reads and writes on top of storage. Egress-free does not mean free to serve, and many small reads can still add up.

R2 pairs with Cloudflare's CDN and Workers, so you can cache public files at the edge and run light logic, such as signed access checks, in front of a bucket.

Say a SaaS offers templates and installers that thousands of customers download each month. Bandwidth is the main cost, and R2 removes it. A team storing huge numbers of tiny files with constant writes would watch operation charges more closely.

R2 suits read-heavy public assets, media and downloads. It may fit less well if you need the full S3 feature set or deep lifecycle tooling.

Before migrating, verify:

• Support for the S3 API calls your code uses, including multipart uploads and presigned URLs
• Versioning, replication and event notification behavior
• Lifecycle rule options for expiring or moving objects

On the pricing page, check current operation rates, free tier limits and any minimum storage terms.

Backblaze B2 is cheap object storage with a pricing model you can explain in one sentence: you pay a flat rate per unit of data stored, plus charges for certain operations. It has no tiers to juggle. It speaks the S3-compatible API, so most existing tools and SDKs work with a changed endpoint and new keys. It also has a native API if you want to use it.

Egress is where B2 gets interesting. Backblaze has historically allowed some free download allowance and has run partnerships with CDN providers so traffic served through them costs less or nothing from the storage side. Terms like these change, so confirm the current egress policy and the list of partners before you commit.

B2 suits:

• database dumps and nightly backups
• user data exports
• archives and large files on a tight budget

It fits less well if you need advanced event notifications or sophisticated replication setups. Check the current feature list against your requirements.

Suppose a bootstrapped team runs a small SaaS app. Every night a script dumps the production database and zips customer CSV exports, then uploads both to a B2 bucket with a lifecycle rule that removes old copies. The bill stays easy to predict, and nobody has to learn a new toolchain, because the existing S3 backup script just points at a different endpoint.

Wasabi charges one flat rate per unit of stored data, with no separate line items for egress or API requests. That makes your bill easy to forecast, which matters when the dataset is big and the budget is small.

The catches are in the terms. Wasabi has a minimum storage duration, so deleting an object early doesn't stop the charge. Its egress policy is also tied to fair use, meaning free egress assumes your downloads stay in proportion to what you store. Read both the fair-use and retention terms before you move real data.

Suppose you upload 1 TB of build artifacts and delete them after ten days, but the minimum retention is 90 days. You still pay for the full retention window. A workload that rewrites its data daily could pay for far more storage than it ever holds at once.

Wasabi suits large, steady datasets with predictable access, like media archives, backups and log retention. It fits poorly with short-lived or churn-heavy objects such as temp files and frequent re-uploads.

Before committing, check:

• The current minimum storage duration and how it applies to deletions
• The egress fair-use wording
• Which regions it offers, and which tools integrate with it

Expect fewer regions and a smaller ecosystem than the big clouds. Confirm both on the current site.

For object storage for startups already running on DigitalOcean, Spaces is the low-friction option. Your droplets, managed databases and storage sit in one dashboard and arrive on one bill, so a two-person team has fewer vendors to track and fewer logins to lose. A built-in CDN can sit in front of the bucket, which helps when you serve images or downloads to users.

The tradeoff is the pricing model. Spaces has historically used a bundled plan with included storage and transfer allowances rather than fully granular, pay-for-exactly-what-you-use billing. That is easy to budget, but it gives you less room to tune costs. Check the current plan details, including what overage costs, before you commit.

For example, suppose your SaaS app runs on a droplet and stores user uploads. Pointing it at Spaces keeps everything in one place and needs little new setup. If your main goal is the lowest per-gigabyte rate for a huge archive, you will probably find cheaper options.

Spaces suits:

• Teams already on DigitalOcean who want simplicity
• Small apps with modest storage and steady traffic

It suits less well:

• Teams chasing the lowest cost per gigabyte
• Workloads that depend on advanced S3 features

Before migrating from AWS S3, test compatibility against the features your app actually uses, such as presigned URLs, multipart uploads, lifecycle rules and bucket policies. Those are where small differences tend to break things.

Hetzner's object storage speaks the S3 API, and its pull is simple: it tends to cost less than the big-name clouds, and your data sits in European data centers. If your customers are in the EU, or your legal team wants data kept in Europe, that combination is hard to ignore.

The tradeoffs are real, though. Expect fewer regions and a thinner feature set than the larger providers offer. Pricing, locations and limits change, so confirm what is available and what it costs on Hetzner's site before you commit.

What to check before moving real data:

• Which locations are offered today, and whether any match your users
• Current storage and traffic pricing, including any included transfer
• Whether the S3 features you rely on (presigned URLs, lifecycle rules, versioning) are supported
• How your upload library behaves against its endpoint

It suits EU-focused products and cost-sensitive builders already running Hetzner compute, since keeping storage next to your servers is convenient. User uploads and backups fit well. It is a weaker choice for a global app whose users are mostly in the US and care about speed.

Location decides whether it works for static assets or media. Suppose your audience is in Texas and your files sit in Germany. Measure download times from a few real devices before you decide, rather than assuming.

MinIO is software you run yourself, not a hosted service. You install it on your own servers or cloud instances, and the cost moves from a monthly bill to operations: servers, disks, upgrades, backups and monitoring. When a disk fails at 2 a.m., that is your problem.

That trade suits teams with ops skills, anyone who needs strict control over where data lives, and developers who want a local test environment. It suits solo founders badly. If you are shipping a product alone, time spent patching a storage cluster is time not spent on customers.

Licensing deserves a careful read. Edition terms and license conditions have shifted over the project's life, so read the current license before you build on it, especially if you plan to offer a product to others.

The safest low-risk use is local development:

• Run it in a container on your laptop.
• Point your app's S3 client at it by changing the endpoint and credentials.
• Test uploads, downloads and presigned URLs without touching a paid account.

For example, suppose production runs on a hosted provider. Your tests can still hit MinIO locally, and the same code works in both places. It also shows early which S3 features your app depends on, which tells you what could break when you switch.