STACKIT Object Storage provides scalable S3-compliant object storage for unstructured data and backups.
Service Overview
Section titled “Service Overview”- S3 API Compatibility: Natively compatible with standard S3 SDKs, Veeam Backup, and AWS CLI tools.
- Object Lock Defense: Immutability locks protect backup datasets against ransomware deletion or alteration.
- No Egress Bandwidth Fees: Pay-as-you-go pricing based purely on stored volume without ingress/egress charges.
Technical Details
Section titled “Technical Details”- Compliance: 100% GDPR-compliant storage hosted inside German data centers (ISO 27001, BSI C5).
- Management: Bucket creation, credential generation, and lifecycle rules controlled via Portal and Terraform.
Limits and Regions
Section titled “Limits and Regions”The values below come from the STACKIT documentation and update themselves.
| Limit | Value | Note |
|---|---|---|
| Max. Object size: | 5 TB | Object Storage Objects can range in size from 1 byte to 5 terabytes. |
| Max. Part Size (multipart upload) | 5 GB | Max size of one part, using multipart upload. |
| Max. number of parts (multipart upload) | 10.000 | Max number of parts, using multipart upload. |
| Max. Bucket size: | no limit | See “tenant quota” |
| Max. Versions per Object | 1000 | If object versioning is used this limitation is applied. |
| Tenant Quota | 500 TB | Can be adjusted on request. Contact our Support |
| Max. Objects per Bucket | no limit | |
| Max. Buckets per STACKIT Project | 1000 | per STACKIT project |
| Credentials Groups | 1000 | per STACKIT project |
| Max. Read/Write Requests per Second | 2500 | per STACKIT project |
| Max. Up-/Download bandwidth | 500 MB/s | per STACKIT project |
| Max. Concurrent Read/Write Requests per Second | 500 | per STACKIT project |
| Bucket Policy size limit | 20,480 Bytes | max. size of a bucket policy |
| Max. Retention for Compliance Lock | 365 days | Max. time that can be set to lock objects |
What is this?
This section is copied from the STACKIT docs automatically, several times a day. It cannot be changed here. Changes belong in the STACKIT docs.
The source shows pictures here that this page leaves out (1). See them in Architecture of Object Storage
Object Storage is available in dedicated regions. Within each region, your data is automatically replicated across all three Availability Zones. This replication happens transparently, you do not need to configure it.
The following diagram shows the structure of Object Storage in an example region (EU01):
Each region has a dedicated endpoint URL. You need to use the endpoint of the region where your bucket resides.
| Region | Endpoint URL |
|---|---|
| EU01 | https://object.storage.eu01.onstackit.cloud |
| EU02 | https://object.storage.eu02.onstackit.cloud |
All STACKIT Object Storage endpoints support TLS 1.3 encryption.
Buckets are region-specific. You can not move a bucket between regions after creation.
What is this?
This section is copied from the STACKIT docs automatically, several times a day. It cannot be changed here. Changes belong in the STACKIT docs.
Limitations & Constraints
Section titled “Limitations & Constraints”- Public API Endpoints Only: Access routes through public regional S3 endpoints (private SNA endpoints in development).
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Tobias M.Head of STACKIT Cloud Framework · STACKITOwnerActive 12 of the last 12 weeks · 168 updatesSTACKITwww.linkedin.com/in/tobias-müller-011304172??Name not publicThe Cloud Framework team knows who this is. The name is not shown on the site.Contributed in STACKITTobias M.
Tobias M.Head of STACKIT Cloud Framework · STACKITOwnerActive 12 of the last 12 weeks · 168 updatesSTACKITwww.linkedin.com/in/tobias-müller-011304172
· Oct 5, 2026