Cloud ERP and on-premise differ mainly in operations, cost structure, and responsibilities. Both models can run the same software. What decides is who carries hardware, updates, backups, and availability, and whether you can still switch later. The right decision follows from resources, industry, and risk profile, not from the current trend.

What cloud ERP typically means

Cloud ERP shifts infrastructure and often operations to the vendor or hosting partner:

• Lower upfront investment, more predictable running costs
• Faster start and scaling by user count or capacity
• Maintenance and updates sit more with the vendor. Internal operations knowledge remains necessary, but differently prioritized
• Data location, subcontractors, and contract terms must be checked actively (GDPR, export, termination)

Cloud takes load off IT for server operations. It does not relieve the company of responsibility for compliance, rights, and exit. Data sovereignty for cloud ERP belongs in the same decision.

What on-premise typically means

On-premise runs the system in your own data center or with a service provider you control:

• Higher upfront investment in infrastructure, in exchange for direct control over servers and network
• Operations, patches, and backups under your responsibility or your IT partner’s under your mandate
• Makes sense for strict compliance requirements, special latency needs, air-gapped environments, or existing data center capacity

On-premise maximizes infrastructure control. Without discipline on backup, patching, and documentation, risk remains. Control without drills is false security.

Which questions must be asked before the decision

Before choosing the operating model, clarify:

1. Where do data, replicas, and backups live, and who has access?
2. Who operates backups and recovery, and has that been tested?
3. Can customizations and export run independently of the hosting model?
4. Can the system later switch to the other operating model?
5. Which internal capacity for operations, monitoring, and releases is realistically available?

Digital sovereignty hangs less on the label cloud or on-premise than on portability and switchability. A cloud system with tested export and clear contracts can be more sovereign than an on-premise system without an exit path.

When hybrid makes sense

Hybrid models are possible when ERP and data stay portable: for example sensitive core processes internally, less critical services in the cloud, or staging in the cloud and production on-premise. The prerequisite is a unified data and configuration model without proprietary hosting dependency. Without portability, hybrid quickly becomes two lock-in problems instead of one.

How to compare cost and risk fairly

Do not compare only hosting prices. Calculate over several years:

• Infrastructure and licenses or usage fees
• Operations staff or managed service
• Updates, security, and outage cost
• Exit and migration effort

Cloud often shifts Capex to Opex. On-premise binds capital and know-how. Which model is cheaper depends on growth, compliance, and team strength. An exit strategy belongs in both variants.

What Nuclos changes about the decision

Nuclos supports cloud and on-premise with the same feature set. The platform is licensed under the GNU AGPL 3.0. Source code and data stay with the company. The right variant follows from your resources and risk profile. Whoever wants to change the operating model later needs portability from the start, not as an afterthought.

Cloud or on-premise is not a matter of belief. It is a control question: who carries operations and risk, and does the company stay able to act when conditions change?