IONOS Object Storage

IONOS Object Storage is the S3-compatible storage service in the IONOS Cloud platform from the German hosting company IONOS. Teams can point existing S3 tools, SDKs and backup software at it to store unstructured data such as backups, media and archives. Its data-management features include versioning, lifecycle rules, replication, and Object Lock for WORM retention and legal holds. Access is controlled with ACLs, bucket policies and CORS rules. Data is encrypted with TLS in transit, and server-side encryption uses AES-256 with either provider-managed (SSE-S3) or customer-managed (SSE-C) keys. The service can also host static websites. It suits European SMBs, IT teams and developers who want GDPR-aligned storage, ISO 27001 certification based on BSI IT-Grundschutz, and predictable bills. Pricing is pay-as-you-go with no minimum charge or contract term. On the US product page, storage is listed at 4.99 USD per TB per month, and API requests and inbound traffic are free. Outbound traffic is billed per GB on a tiered scale. An independent benchmark from 2026 quoted 0.03 USD per GB for the first 2 TB. Georedundant storage costs extra. Because it uses the S3 API, it works with common backup tools and IONOS Cloud compute, and traffic from VMs in the same data center is billed as local traffic. The main limitation is a narrow feature set compared with hyperscalers. It has a single storage class with no cold tier, no event notifications, no native CDN and no KMS integration, and egress fees can dominate the cost of read-heavy workloads.