6 Key Differences Between On-Premises and SaaS Software

According to Jupiter Research, revenues generated from enterprise software-as-a-service (SaaS) reached $53.8 billion in 2018, up from $23.2 billion in 2013 — more than doubling in five years.

Those numbers reflect a broader shift already visible in the market: many established software vendors now offer a SaaS product alongside their traditional on-premises version, and some have moved to SaaS exclusively. Adobe is a clear example, maintaining both Adobe Creative Cloud (SaaS) and Adobe Creative Suite (on-premises). Similarly, Piwik PRO offers both a cloud-hosted SaaS edition and an on-premises web analytics deployment.

SaaS has fundamentally improved how software is delivered to businesses and end users. But that shift also introduces a new set of responsibilities for software providers — responsibilities that go well beyond simply building the product. Successfully launching and maintaining a SaaS offering requires rethinking how software is hosted, supported, and secured.

Here are six areas that demand special attention when providing and hosting SaaS, and how they differ from the on-premises model.

1. Data Locality

Data locality is largely a non-issue with on-premises software — the customer controls where their infrastructure lives, and compliance is their responsibility. With SaaS, that responsibility transfers to the provider.

Many countries have enacted strict laws governing how user data is transferred and stored, requiring that data be hosted in the same country where it is collected. SaaS providers operating across multiple markets must comply with these regulations proactively — typically by standing up data centres in the relevant jurisdictions. This adds infrastructure complexity that simply doesn't exist in a traditional on-premises model.

2. Upscaling and Downscaling

Elastic scalability is one of the most tangible advantages SaaS offers users. When traffic or usage spikes, a SaaS platform can scale up — usually horizontally — in near real-time, without any performance degradation visible to the user. Users can scale capacity up or down as needed and only pay for what they actually consume.

With on-premises software, a sharp increase in demand typically means procuring and configuring additional hardware (additional servers, expanded storage, etc.), which is both slower and more expensive.

For SaaS providers, delivering this experience requires a robust infrastructure capable of handling rapid capacity changes without service interruption. That means implementing horizontal scaling (adding more servers), vertical scaling (increasing the capacity of existing servers), or — most commonly — a combination of both.

3. Client Onboarding

Installing on-premises enterprise software is inherently a technical undertaking. It involves configuring environments, managing dependencies, and setting up the software before a user can even begin working with it.

SaaS removes those installation steps for the end user — in principle. In practice, SaaS providers need to design an onboarding flow that works for users across a wide range of technical backgrounds. A step-by-step setup process that guides even the least technical user through configuration is essential. Instructions need to be clear, the process needs to be fast, and the experience needs to feel straightforward regardless of the user's skill level. Poor onboarding is one of the fastest ways to undermine the perceived simplicity of a SaaS product.

4. Regular and Seamless Upgrades

In an on-premises environment, upgrades require manual effort from the customer: downloading new versions, reconfiguring the environment, scheduling downtime, and managing compatibility issues. Many organizations running on-premises software end up stuck on older versions simply because upgrading is too disruptive.

SaaS eliminates this friction for users. Providers can push new versions — carrying bug fixes, new features, and security patches — to all users simultaneously, with no action required on the user's side.

That said, "seamless" upgrades don't happen automatically. Providers need to plan upgrade rollouts carefully, account for how changes might affect users' existing configurations or integrations, and mitigate any performance impact during the transition. The upgrade burden shifts entirely from the customer to the provider.

5. Security and Data Protection

The principle that prevention is better than a cure applies with particular force to SaaS security.

In an on-premises deployment, the organization running the software bears responsibility for securing it. In SaaS, that responsibility rests entirely with the provider — they are collecting and storing user data, and any breach is their liability.

This means SaaS system administrators need to adopt a proactive security posture: continuously monitoring for threats, hardening infrastructure, and working to prevent breaches rather than simply responding to them after the fact. Adhering to established security frameworks and best practices is not optional — it is foundational to operating a trustworthy SaaS platform. The privacy and data integrity of every user depends on it.

6. Support, Maintenance, and Monitoring

SaaS typically delivers a higher standard of support than on-premises software. Users benefit from more responsive assistance and, in most cases, unlimited support — a significant contrast to on-premises plans, where support time is often capped or metered.

On the provider side, this expectation requires investing in dedicated monitoring and maintenance systems that can surface issues quickly and keep the service reliable. Monitoring can't be an afterthought in SaaS — it's a core operational function. A degraded service affects all users simultaneously, which raises the stakes considerably compared to issues isolated to a single on-premises deployment.

Understanding these six dimensions — data locality, scalability, onboarding, upgrades, security, and support — is essential for any organization evaluating SaaS as a delivery model, whether as a provider building a new platform or as a buyer assessing what a SaaS vendor is actually committing to. The differences run deeper than simply "cloud vs. local install"; they represent a wholesale shift in where operational responsibility sits.