Cloud vs on-premise ERP: which to choose?

Choosing between a cloud ERP and an on-premise ERP is one of the biggest technology decisions a company makes. It isn't just a technical question: it affects operating costs, your capacity to grow, the way your team works and, ultimately, how competitive your business is.

For decades, on-premise (installed locally on the company's own servers) was the only option. As cloud technology has matured, cloud ERP has become an increasingly attractive alternative, especially for SMEs and growing companies. Even so, on-premise still makes sense in certain situations.

In this article we take an in-depth look at the differences between the two models so you can make an informed decision based on what your organization actually needs.

Key differences

Before getting into the detailed comparison, it helps to understand what each model involves:

On-premise ERP

An on-premise ERP is installed on the company's own physical servers (or in a contracted data center). The organization owns the software licenses and is responsible for the entire infrastructure: servers, networking, storage, backups, updates and maintenance.

That means a significant upfront investment (CAPEX) in hardware and licenses, plus an in-house IT team or a managed service provider to handle ongoing maintenance.

Cloud ERP

A cloud ERP runs on the vendor's servers (or on public cloud infrastructure such as AWS, Azure or Google Cloud). Your team accesses it through a web browser, with nothing to install on your own servers. The vendor takes care of the infrastructure, updates, backups and system security.

You pay by subscription (OPEX): a monthly or annual fee per user that covers software access, hosting and technical support.

Cost analysis: TCO (total cost of ownership)

For many companies, cost is the deciding factor. But comparing the two models isn't as simple as it looks, because the cost structure is fundamentally different.

On-premise ERP costs

Software licenses: with perpetual licensing, you pay according to the ERP, the modules and the number of users.
Hardware: servers, storage, networking, uninterruptible power supplies (UPS) and cooling for the server room.
Implementation: consulting, customization, data migration, team training and go-live. This is usually the biggest cost of the project.
Annual maintenance: check which updates and support the contract includes, how it renews and which services are billed separately.
IT staff: system administrators to manage the infrastructure, apply security patches, run backups and fix incidents.
Hardware refresh: servers last 3 to 5 years, after which they need replacing.

Cloud ERP costs

Subscription: a monthly or annual fee based on users and features. Check whether it includes hosting, updates, backups and support.
Implementation: lower than on-premise (there's no infrastructure to set up), but you still need consulting, data migration and training.
Customizations: depending on the cloud ERP, customizations may cost extra or be limited.

In the short term (1–3 years), cloud ERP is usually cheaper because there's no upfront investment in hardware and licenses. In the long term (5–10 years), the accumulated subscription fees can match or exceed the cost of on-premise. The key is to calculate TCO over at least 5 years.

Scalability

Scalability measures how well the system can grow (or shrink) as your business needs change.

Cloud: elastic scalability

Cloud ERP scales almost instantly. If your company grows and you need more users, more processing power or more storage, you simply change your subscription plan. No new servers to buy, no waiting weeks for them to be installed and configured.

This elasticity is especially valuable for businesses with seasonal demand (an online store whose activity multiplies at Christmas, for example) or for fast-growing startups.

On-premise: planned scalability

Scaling an on-premise ERP takes planning and time. You have to buy new hardware, install it, configure it and migrate data, which can take weeks or months. Hardware investment is also always a gamble: you may fall short (and need to expand again soon) or oversize (and waste resources).

And if your business scales down, on-premise means you keep paying to maintain hardware you no longer need, whereas in the cloud you can simply reduce your subscription.

Remote access and mobility

Being able to access your ERP from anywhere matters more and more, especially now that remote work is commonplace.

A cloud ERP is accessible from any device with an internet connection and a web browser. Whether employees are in the office, at home, traveling or on a job site, they have full access to the same information and features. That makes remote work, managing distributed teams and real-time decision-making from anywhere far easier.

An on-premise ERP is, by default, only accessible from the company's local network. Remote access requires setting up a VPN (virtual private network) or a remote desktop service, which adds technical complexity, potential performance issues and extra costs.

Security

Security is one of the most debated topics in the cloud vs on-premise comparison, and also one surrounded by the most myths.

Security in the cloud

The major cloud providers (AWS, Azure, Google Cloud) invest billions of euros a year in security. Their data centers hold certifications such as ISO 27001, SOC 2 and ENS (Spain's National Security Framework). They use encryption in transit and at rest, advanced firewalls, intrusion detection systems, continuous audits and dedicated 24/7 security teams.

For the vast majority of companies, especially SMEs, the level of security a professional cloud provider offers is significantly higher than anything they could achieve with their own resources.

On-premise security

With an on-premise ERP, security depends entirely on the company. That can be an advantage if the organization has a competent cybersecurity team and invests properly in security infrastructure. For many SMEs, though, keeping on-premise infrastructure secure is a constant struggle: pending security patches, misconfigured firewalls, unverified backups and lack of monitoring are common problems.

In regulated industries (banking, healthcare, defense) or companies handling extremely sensitive data, the full control over infrastructure that on-premise provides may be a regulatory requirement or a strategic preference.

The question isn't "Is the cloud or on-premise more secure?" but "Who can manage the security of my data better: my in-house team or a specialized cloud provider?"

Updates and maintenance

In the cloud: automatic updates

One of the big advantages of cloud ERP is that updates are the vendor's responsibility. They're applied automatically and continuously, without any action on your part. You always work with the latest version of the software, with the newest features and security patches.

The downside is that you can't choose when updates are applied, or decline them. Sometimes an update changes the interface or how a feature behaves, and users have to adapt.

On-premise: controlled updates

With an on-premise ERP, you decide when and how to update. You can schedule updates for quieter periods, test them in a staging environment before applying them in production, and roll back if something goes wrong.

But that freedom comes at a price: many companies postpone updates indefinitely for lack of time or resources, and end up on outdated versions that pile up security vulnerabilities and lack modern features. Migrating between major versions of an on-premise ERP can be a costly, complex project.

Vendor lock-in

The risk of vendor lock-in exists in both models, but it shows up in different ways:

Cloud: your data lives on the vendor's infrastructure. If you decide to switch ERP or cloud provider, you have to migrate all of it. Make sure the contract includes clear clauses on data ownership, export formats and retention periods after cancellation.
On-premise: you have physical control of your data, but you still depend on the ERP vendor for licenses, updates and support. If the vendor discontinues the product or changes its licensing terms, you can find yourself in a difficult position.

To minimize vendor lock-in, a good practice is to choose open-source solutions (such as Dolibarr, Odoo or ERPNext) that give you more freedom to migrate, customize and choose your hosting provider.

Infrastructure requirements

On-premise

An on-premise ERP needs substantial infrastructure:

Servers with enough capacity for the database and the application.
Redundant storage (RAID) to prevent data loss.
A high-speed internal network.
An uninterruptible power supply (UPS) and a backup generator.
Proper cooling for the server room.
A backup system with off-site storage.
A redundant internet connection if remote access is needed.

Cloud

A cloud ERP only needs a reliable internet connection and devices with a web browser. No server room, UPS, cooling or local storage. That drastically reduces infrastructure requirements and the physical space you need.

Hybrid models

You don't always have to choose strictly between cloud and on-premise. Hybrid models combine the best of both, keeping certain data or modules on local servers (sensitive production data, for example) while moving others to the cloud (such as the CRM module for the sales team, or payroll).

Hybrid models are especially useful for:

Companies in transition that want to move to the cloud gradually without disrupting operations.
Organizations with regulatory requirements that certain data stays on their own infrastructure.
Companies with industrial processes that need low latency and local connectivity (edge computing).

The key to a successful hybrid model is seamless integration between the cloud and on-premise components, so data syncs in real time and users get a unified experience.

When to choose each option

Choose a cloud ERP if:

You're an SME or startup with a limited budget for upfront investment.
Your team works remotely or across several locations.
You don't have a dedicated IT department or would rather not manage infrastructure.
You need to scale quickly (in users, data or features).
You want predictable costs with fixed monthly fees.
You value always having the latest version of the software with no update effort.

Choose an on-premise ERP if:

Your industry is regulated and requires data to stay on your own infrastructure.
You need deep source-code customizations that aren't possible in SaaS.
You have a competent IT department with the capacity to manage the infrastructure.
You handle such large volumes of data or transactions that the cloud would cost more in the long run.
Your business needs ultra-low response times that depend on local network latency.
You prefer full control over updates and maintenance cycles.

Market trends

The global trend is clear: the ERP market is moving to the cloud. According to Gartner estimates, more than 60% of new ERP implementations are already in the cloud, and that share grows every year. The major vendors (SAP, Oracle, Microsoft) are investing heavily in their cloud versions and, in some cases, have stopped developing new features for their on-premise editions.

That doesn't mean on-premise will disappear any time soon, but companies choosing it should be aware that the ecosystem (partners, developers, integrations) is increasingly geared toward the cloud.

Among Spanish SMEs, cloud ERP adoption is accelerating thanks to better telecom infrastructure, the spread of remote work and digitalization grants such as Spain's Kit Digital program.

Conclusion

There's no universal answer to "cloud or on-premise?". The best choice depends on your company's size, industry, regulatory requirements, in-house technical capacity, budget and growth strategy.

What is universal is the need to analyze the decision rigorously: calculate TCO over at least 5 years, assess your real requirements (not the perceived ones) and consider not just where your business is today but where it's heading.

A common mistake is choosing on-premise out of inertia ("we've always done it this way") or choosing cloud because it's the trend ("everyone's moving to the cloud"). Both options are valid, but the decision should rest on an objective analysis of your organization's needs and capabilities.