Choosing The Right Deployment Model For Your Business: SAP On-Premise vs Public Cloud

Introduction

SAP systems can be deployed in a variety of ways, but for a long time it's been either on-premise solutions or the cloud. If you're looking at your SAP landscape and planning a transformation, you'll want to get this decision right. In fact, it's not just about the tech - it affects every aspect of your business, from flexibility and scalability to cost and long-term strategy.

So, what's the goal here? Simply put, choose the right deployment model for you. One that aligns with your business needs and future growth.

What SAP on-premise really means

SAP On-Premise refers to SAP systems installed and running on an organisation's own servers, within their own infrastructure. Think: your own servers in your own data centre, your own internal teams managing them, and total control over configuration and customisation.

That means you're responsible for:

• Hardware and infrastructure

• System maintenance and upgrades

• Security and performance

SAP on-premise in practice

In a typical on-premise setup:

• SAP is running on internal servers in your own data center

• Your IT teams are handling uptime, performance and data security

• Updates are applied on a schedule and are not always mandatory

• Customisations are built directly into the system

That gives you:

• Total control

• A flexible configuration

• But requires:

• Significant internal resources and expertise

• Ongoing maintenance effort

• Longer implementation timelines for on-premise deployments

Benefits of SAP on-premise

• Control: Full ownership of systems and data

• Customisation: Ability to modify systems extensively. In fact, many teams keep their existing systems landscapes in place because the implementation approach can be tailored around data governance needs, such as financial reporting

• Security control: Internal handling of security policies, which often means stronger data security for sensitive data and better alignment with stringent compliance requirements in regulated on-premise deployments

• Stability: Established, well-understood environments that are often preferred as an on-premise solution in complex SAP software estates

Challenges of SAP on-premise

• High upfront costs: Infrastructure and maintenance expenses, added cost considerations around ongoing infrastructure ownership and internal support

• Limited scalability: Expansion requires new hardware

• Complex upgrades: Manual and resource-intensive, especially in legacy SAP ECC environments

• Slower innovation: New features are not delivered automatically

What SAP Public Cloud really means

SAP Public Cloud refers to cloud ERP delivered as a service, with SAP S/4HANA Cloud being the cloud version of SAP ERP.

This includes:

• SAP S/4HANA Public Cloud

• SAP Business Technology Platform (BTP)

• SAP Cloud ERP, including 4HANA Cloud Public Edition

• Cloud-based SAP applications

Systems are hosted and managed by SAP or cloud providers. SAP S/4HANA Cloud also includes SAP-managed data protection and compliance measures.

Organisations can access them via:

• Secure internet connections

• Subscription-based models: a software as a service (SaaS) approach that usually lowers initial upfront costs and reduces upfront costs through a subscription model, making it a scalable SaaS solution

SAP Public Cloud in practice

In a cloud environment:

• Systems run in shared cloud infrastructure

• Updates are delivered regularly and mandatory software updates must be adopted within SAP's release timelines

• Resources scale automatically

• Users access SAP from anywhere

• Rapid deployment is a major benefit - SAP S/4HANA Cloud can often go live in weeks

This gives you:

• Flexibility

• Faster innovation

• Reduced infrastructure management

Benefits of SAP Public Cloud

• Scalability: Resources expand as needed - and public cloud solutions are well-suited to changing demand

• Flexibility: Easy adaptation to business changes through a scalable cloud solution

• Lower infrastructure burden: No need to manage hardware, with managed services handled by the provider for added cost efficiency

• Continuous innovation: Regular system updates, reflecting SAP's cloud offerings as central to SAP's strategy and where SAP has invested heavily

• Accessibility: Remote and global access

Challenges of SAP Public Cloud

• Less customisation: Standardised processes preferred

• Dependence on provider: Less direct system control

• Change management: Frequent updates require some adaptation

• Subscription costs: Ongoing operational expense

SAP on-premise vs SAP Public Cloud

There are significant differences between the two models.

SAP on-premise:

• Full control

• High customisation

• Internal management

• Higher upfront costs

SAP Public Cloud:

• Standardised systems

• Managed by provider

• Scalable infrastructure

• Subscription-based, with lower initial costs. A cloud version of SAP Cloud ERP Private, including SAP Cloud ERP Private as a cloud deployment option, can serve as a midpoint between choosing a fully on-premise method and public cloud.

The shift is more from control and customisation to a focus on flexibility and scalability.

SAP on-premise vs cloud: when to choose each

SAP on-premise suits organisations who are after:

• Complex customisation - the kind that can't be done as easily in the cloud

• A high level of control over their systems - the kind that can be a challenge in cloud

• They've already got an established infrastructure - no need to change that at this stage

• They have to meet strict regulatory or compliance demands - in which case enhanced security and compliance is a must

SAP public cloud on the other hand is a good fit when:

• Agility and scalability are top of mind - things that public cloud does well

• You need to implement things in a hurry - public cloud can get you up and running faster

• Standard processes are okay with you - you don't need all the customisation of on-premise

• Lower upfront costs and less IT overhead are a priority - in which case standardisation on public cloud makes sense

A single tenant private cloud like SAP Cloud ERP Private can be a good compromise for organisations that want a bit more control than public cloud but aren't ready to go all the way back to on-premise.

Hybrid approaches: combining on-premise and private cloud models

Many organisations take a hybrid approach:

This can involve:

• Putting core ERP on-premise or private cloud

• Using public cloud (BTP) for extensions and innovation

It allows:

• Stability in the core systems

• Flexibility in new development

SAP Public Cloud and clean core strategy

SAPs modern strategy is all about clean core architecture:

This means:

• Keeping your ERP systems standard

• Moving custom logic to cloud platforms

SAP public cloud makes this easy:

• It encourages standard processes

• It enables you to extend your system outside of the core

SAP deployment in practice

A typical modern setup might be:

• SAP S/4HANA Cloud for ERP - with built in AI and machine learning to improve decisions and automate workflows

• SAP BTP for integration and development

• Analytics platforms for reporting, real-time analytics and predictive analytics

Or:

• Legacy on-premise ERP - often based on SAP ECC

• Cloud based extensions and tools

The key is to make sure your systems and business needs are aligned.

Benefits of choosing the right SAP deployment

When you get it right:

• Efficiency - workflow automation and AI means reduced complexity and better performance

• Scalability - your systems grow with the business

• Visibility - real time data and reporting with AI driven insights supports faster decision making and risk mitigation

• Flexibility - you can adapt to change

• Cost control - optimised infrastructure and operations

Common challenges when choosing SAP deployment

Organisations often struggle with:

• No clear strategy - they're not sure if they should go cloud or stick with on-premise

• Over customisation - which makes cloud adoption a nightmare

• Integration complexity - trying to connect different environments

• Change resistance - getting people to adapt to new ways of working

These challenges require:

• Clear decision making

• Strong governance and data governance

Why SAP environments drift over time

Things change:

• Systems evolve

• New tools get added

• Business needs change

Unless you are on top of it:

• Complexity increases

• Costs rise

• Performance declines

Whether on-premise or cloud ongoing management is a must.

The role of AMS in SAP deployment

Application Management Services (AMS) can:

• Monitor your systems

• Optmise performance

• Fix issues

• Keep things improving

AMS makes sure:

• Your systems stay aligned

• Value is sustained

How SAP consultancy supports deployment decisions

SAP consultancy can help you:

• Choose the right deployment model

• Plan your cloud or on-premise strategy

• Align your systems with business processes

• Simplify complex landscapes

This leads to:

• Better long-term outcomes

SAP on-premise and cloud in modern environments

Modern SAP landscapes often include a mix of:

• On-premise systems

• Public cloud platforms (and some organisations also use SAP Sovereign Cloud for local data protection or residency rules)

• Integration tools (SAP BTP) - including the integration suite as part of SAP Cloud Solutions

This leads to:

• Flexible architectures

• Scalable systems

• A continuous innovation capability

So, what does good SAP deployment look like?

When it works well:

• Your systems are aligned with business needs

• Integration is seamless

• Data is consistent - thanks to the simplified model in SAP S/4HANA

• Infrastructure supports growth - with deployment options and cloud options aligned to business goals

• Complexity is under control

The result - an SAP environment that works for the business, not against it.

Glossary

SAP on-premise: SAP systems hosted on your own infrastructure

SAP Public Cloud: SAP systems delivered as cloud services

SAP S/4HANA Cloud Public Edition: Cloud based SAP ERP platform

SAP Cloud ERP: SAPs cloud-based ERP offering

SAP BTP: Platform for integration and development

SAP Integration Suite: SAP BTP capability for connecting SAP and third-party systems

Clean core: Keeping your ERP standard while extending externally

AMS: Ongoing support and fine-tuning

Things to think about

What is SAP on-premise anyway?

It means you're hosting and totally in charge of your SAP system - think of it as having it installed in your own home.

What is SAP public cloud?

This is where SAP's cloud-based ERP services come in - think SAP S/4HANA Cloud, but delivered to your business as a service.

SAP on-premise or cloud - which is the 'better' one?

The answer to this depends on what your business actually needs and is trying to achieve.

When does SAP on-premise make more sense?

When your business needs to call the shots, get really deep into customising things, or deal with compliance rules that are pretty strict.

Is there some middle ground between on-premise and the public cloud?

Well, yes - something like a private cloud edition where you get a single-tenant deployment can offer a pretty good compromise.

Can SAP be used in a hybrid set-up?

Oh, yeah - loads of businesses have both models in place.

Why are so many companies shifting to SAP cloud?

For the simple reasons of scalability, flexibility and not having to worry about the old IT infrastructure.

Making SAP work for your business

SAP on-premise and public cloud aren't mutually exclusive, they're just two different ways to get what you want from SAP. And remember that SAP's got a plan to be moving everyone to S/4HANA by 2027 - that's worth thinking about too. Just pick the balance that's right for your business, and SAP can be a platform that helps you grow, rather than getting in the way.