License & Deployment Mix: 27 tools – 13 OSS, 13 SaaS. (OSS and SaaS counts can overlap when an open-source tool also offers a vendor-hosted edition.)

What Is Object Storage?

Object storage is a data storage architecture that manages data as discrete units called objects, each containing the data itself, a variable amount of metadata, and a globally unique identifier (key). Unlike block storage (which operates on fixed-size blocks within volumes) or file storage (which organizes data in hierarchical directory trees), object storage uses a flat address space where every object is accessed via its key within a bucket (a logical container).

The Amazon S3 API has become the de facto standard for object storage. Originally proprietary to AWS, the S3 API is now implemented by dozens of self-hosted and cloud storage systems, making it the universal lingua franca for object storage operations. S3 compatibility means applications can switch between storage backends (MinIO, Ceph, Backblaze B2, Wasabi) with minimal code changes.

Core object storage concepts:

• Buckets and objects – buckets are top-level containers; objects are stored within buckets and identified by a unique key (path-like string); objects have no inherent hierarchy (the / in keys is a convention, not a directory boundary)
• Metadata – each object carries system metadata (size, content-type, ETag, last-modified) and optional user-defined metadata (key-value pairs); metadata is stored alongside the object and returned with API responses
• Versioning – when enabled on a bucket, every PUT/DELETE creates a new version of the object; previous versions are retained and accessible by version ID; protects against accidental overwrites and deletions
• Erasure coding – data durability technique that splits objects into data and parity fragments distributed across drives or nodes; can tolerate multiple simultaneous drive or node failures without data loss; more storage-efficient than simple replication (typically 1.3-1.5x overhead vs 2-3x for replication)
• Storage classes – tiers that trade access latency and retrieval cost for lower storage cost; common tiers include hot (frequent access), warm (infrequent access), cold (rare access), and archive (long-term retention with retrieval delays of minutes to hours)
• Lifecycle policies – rules that automatically transition objects between storage classes based on age (e.g., move to cold after 90 days) or expire objects after a retention period; essential for cost optimization
• Object locking and WORM – Write Once Read Many compliance; prevents object deletion or modification for a specified retention period; required for regulatory compliance (SEC 17a-4, HIPAA, GDPR data retention)
• Presigned URLs – temporary, signed URLs that grant time-limited access to specific objects without requiring the requester to have storage credentials; commonly used for secure file uploads and downloads in web applications
• Multi-site replication – asynchronous or synchronous replication of objects between geographically distributed storage clusters; provides disaster recovery, data locality, and regulatory compliance for data residency requirements
• IAM and bucket policies – fine-grained access control via identity-based policies (who can do what) and resource-based policies (what can be done to this bucket); support for conditions (IP ranges, time windows, MFA requirements)

Object storage is the backbone of modern cloud infrastructure. It stores everything from application artifacts and backup archives to data lake datasets and media files. Its combination of scalability, durability (typically 11 nines – 99.999999999%), and simple HTTP-based access makes it the preferred storage layer for distributed systems.

The information on these pages was researched by a combination of human review and large language models. To suggest an addition or correction, please contact us. Prepared by Rhodium Systems Inc., author of the ResorsIT platform — a unified IT operations management platform for IT teams and MSPs that integrates a curated suite of open-source, commercial, and SaaS applications into a single system with shared identity, single sign-on, access control, and a common audit trail. Use this catalogue only as a starting point for your own research, and review any tool carefully against your own requirements before relying on it. Catalogue data version 2026.197.

Comparison

Overview Comparison

S3 API Compatibility

* Swift uses its own API natively; S3 compatibility is via the s3api middleware (swift3), which maps S3 calls to Swift operations.

Performance & Durability

Note: Self-hosted durability depends entirely on cluster size, erasure coding configuration, and hardware quality. There is no inherent durability SLA – it is determined by the deployment architecture.

Storage Features

Multi-Site & Replication

Access Control & Security

SSO / Identity

Best SSO support: MinIO (OIDC STS, LDAP), Ceph (Keystone + STS), AWS S3 (IAM + Cognito), LakeFS (native OIDC)

No SSO: SeaweedFS, Garage, Cloudflare R2, Backblaze B2, Storj, DigitalOcean Spaces, Linode, Vultr (access key only)

Monitoring Integration

Best monitoring integration: MinIO, Ceph, RustFS (Prometheus metrics, structured logs, official Grafana dashboards).

Cloud providers: AWS S3 has the best cloud monitoring integration via CloudWatch + Grafana data source.

Tools

26 tools.

AWS S3

Amazon Simple Storage Service (S3) is the original and defining cloud object storage service, launched in 2006. S3 established the API standard that nearly all competing object storage services now emulate.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Azure Blob Storage

Azure Blob Storage is Microsoft’s cloud object storage service, tightly integrated with the Azure ecosystem and Microsoft 365.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Backblaze B2

Backblaze B2 is a low-cost, S3-compatible cloud object storage service priced at roughly one-fifth the cost of AWS S3.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Ceph (RADOS Gateway)

Ceph is a unified distributed storage platform providing object, block, and file storage in a single cluster.

License: LGPL-2.1-or-later (OSS) · Kind: web · Deploy: native · SSO: none

Website · Source

Cloudflare R2

Cloudflare R2 is an S3-compatible object storage service with a defining differentiator: zero egress fees.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

DigitalOcean Spaces

DigitalOcean Spaces is an S3-compatible object storage service designed for simplicity and predictable pricing.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Garage

Garage is a lightweight, self-hosted, S3-compatible object storage system built by Deuxfleurs, a French self-hosting collective.

License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

Google Cloud Storage

Google Cloud Storage (GCS) is Google’s unified object storage service offering high durability, strong consistency, and deep integration with the Google Cloud ecosystem.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

IDrive e2

IDrive e2 is an S3-compatible cloud object storage service offering the lowest per-GB pricing among major providers at $0.004/GB/month ($4/TB/month).

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

LakeFS

LakeFS is a Git-like version control system for data lakes that provides branching, committing, merging, and reverting operations over object storage.

License: Apache-2.0 (OSS) · Kind: web · Deploy: native, docker, k8s · SSO: none

Website · Source

Linode Object Storage (Akamai)

Linode Object Storage, now part of Akamai Connected Cloud, is an S3-compatible object storage service offering simple pricing and integration with Akamai’s global CDN and compute infrastructure.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

MinIO

MinIO is the most widely deployed self-hosted S3-compatible object storage platform, with over 60,000 GitHub stars and billions of Docker pulls before its open-source repository was archived in February 2026.

License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

MinIO Client (mc)

MinIO Client (mc) is a command-line tool that provides UNIX-like commands for interacting with any S3-compatible object storage.

License: AGPL-3.0-only (OSS) · Kind: web · Deploy: saas, docker, k8s, package · SSO: none

Website · Source

OpenIO

OpenIO SDS (Software-Defined Storage) is a distributed object storage platform designed for large-scale unstructured data, Big Data, HPC, and AI workloads.

License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

OpenStack Swift

OpenStack Swift is the object storage component of the OpenStack cloud platform. It provides a large-scale distributed object store with its own Swift API and an S3-compatible middleware layer (s3api).

License: Apache-2.0 (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

Oracle Cloud Object Storage

Oracle Cloud Infrastructure (OCI) Object Storage is a scalable, durable object storage service within the Oracle Cloud ecosystem.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC

Website

Rclone

Rclone is a command-line program for managing files on cloud storage, often described as “rsync for cloud storage.” It supports over 70 cloud storage providers including Amazon S3, Google Cloud Storage, Azure Blob, Backblaze B2, Cloudflare…

License: MIT (OSS) · Kind: web · Deploy: saas, docker, native, package · SSO: none

Website · Source

RustFS

RustFS is a high-performance, S3-compatible distributed object storage system written in Rust, offering erasure coding, single-node and distributed modes, and a web console under a permissive Apache-2.0 license.

License: Apache-2.0 (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

S3-to-Filesystem Backup Strategy

SaaS tools that store data in S3-compatible object storage (or expose data via S3 APIs) need a reliable backup mechanism that:

License: Proprietary (proprietary) · Kind: web · Deploy: saas, docker, native, k8s, package · SSO: none

Website

S3cmd

S3cmd is a command-line tool for uploading, retrieving, and managing data in Amazon S3 and other S3-compatible storage services.

License: GPL-2.0-only (OSS) · Kind: web · Deploy: saas, docker, package · SSO: none

Website · Source

S3Proxy

S3Proxy is a Java-based proxy server that implements the S3 API and translates requests to other storage backends.

License: Apache-2.0 (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

SeaweedFS

SeaweedFS is an open-source distributed storage system for blobs, objects, and files, offering O(1) disk seek for small files, an S3-compatible gateway, erasure coding, and cross-datacenter replication.

License: Apache-2.0 (OSS) · Kind: web · Deploy: native, docker · SSO: none

Website · Source

Storj

Storj (pronounced “storage”) is a decentralized cloud storage platform that distributes encrypted, erasure- coded data fragments across a global network of independent storage node operators.

License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, saas · SSO: none

Website · Source

Tigris

Tigris is a globally distributed, S3-compatible object storage service built on FoundationDB, with automatic access-based data placement, storage tiers, object versioning, and zero egress fees.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Vultr Object Storage

Vultr Object Storage is an S3-compatible object storage service offered as part of Vultr’s cloud infrastructure platform.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website

Wasabi

Wasabi provides hot cloud storage at cold storage prices, offering S3-compatible object storage at roughly $7/TB/month with no egress or API request fees.

License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none

Website