SaaS vs on-premise is a choice about whose servers an application runs on and who does the work of running it. With SaaS (software as a service), the provider handles servers, updates and infrastructure backups for a subscription. With on-premise software, the system sits on your own hardware: you keep control, and the maintenance. The right answer differs per application.
What the argument in the meeting room is really about
When a new system is on the table, the discussion usually splits into two camps. One says, "Everything is in the cloud now; let's stop looking after servers." The other replies, "Our data shouldn't live somewhere else, and if the internet goes down, we stop." Both have a point, but because both are looking for a single answer for every system, the argument never ends.
It helps to separate this question from custom versus off-the-shelf software. That decision answers "who writes the software?". This one answers "where does it run, and who operates it?". An off-the-shelf package can be installed on your own server, and software written specifically for you can be run in the cloud on a subscription basis. Mixing the two questions leads to decisions that look sensible for the wrong reasons. For an online shop, the same choice is covered in ready-made ecommerce vs custom build.
In practice there are three models. SaaS is operated entirely by the provider. On-premise software runs in your own server room. In between sits private cloud or hosted deployment: your own copy of the software runs in a data centre, managed by you or a partner.
What choosing the wrong model costs
A poor choice rarely shows on day one; it is paid for in instalments over several years. In Türkiye, paid cloud services are still a minority choice. According to TÜİK's ICT Usage Survey in Enterprises, 2026, 20.2% of Turkish enterprises used paid cloud computing services: 57.0% of those with 250 or more employees versus 16.7% of those with 10 to 49. The smaller the firm, the lower the rate, so in small businesses the deployment question is often answered by keeping the existing set-up rather than by asking it application by application.
Those who move to the cloud carry their own risk, because business app sprawl, unmanaged subscriptions and resources grow quietly:
Flexera's survey of more than 750 cloud decision-makers and users found that wasted cloud spend rose for the first time in five years, to 29%, and that managing cloud spend remains a top challenge for 85% of respondents. (Flexera 2026 State of the Cloud Report)
Dependence on a provider also shows up in security. The Verizon 2026 Data Breach Investigations Report found that breaches involving a third party rose 60% to 48% of all breaches, and only 23% of third-party organisations fully remediated missing or weak multi-factor authentication on their cloud accounts. Choosing SaaS does not hand security over; it turns it into the job of checking your provider.
For systems holding personal data, regulation enters the calculation. Article 9 of Türkiye's data protection law (KVKK) ties transfers of personal data abroad to adequacy decisions, appropriate safeguards such as standard contracts, or narrow exceptions. The Turkish Data Protection Authority's 2025 Annual Activity Report shows that of 89 written undertakings for transfers abroad reviewed that year, only 13 were approved. If a SaaS product stores data outside Türkiye, the legal basis must be settled before you sign. For on-premise software, see our guide to the software maintenance agreement to put updates and support in writing.
SaaS vs on-premise: an eight-criterion comparison
| Criterion | SaaS | On-premise | Private cloud / hosted |
|---|---|---|---|
| Getting started | Live once the account opens | Needs servers, licences and installation | Rent servers, then install |
| Cost structure | Recurring subscription per user or usage | Up-front licence and hardware, then maintenance | Infrastructure rental plus operating effort |
| Updates and patching | Provider does it, on its schedule | Your team does it | You or a partner do it |
| Data location | Provider's data centre, defined by contract | Your own building | A data centre you choose |
| Customisation | Limited to settings and add-ons | Broad; broadest with source code access | Broad |
| Local system integration | Via APIs; reaching on-site devices is harder | Direct to machines, PLCs and local ERP | Via VPN or gateway |
| During an internet outage | Access stops | Keeps working on the internal network | Depends on the link |
| Exit and portability | Depends on export rights | Data is already with you | Data is yours; moving is easier |
No single row wins the decision on its own. For a remote sales team, the outage row matters less, because they work over the internet anyway. For a label printing station on the factory floor, it is the row that decides everything.
A step-by-step way to decide
Make the decision per application, not at the level of "the company is moving to the cloud". This sequence moves the discussion from opinion to evidence:
- List and classify your applications. Email, file sharing, ERP, production tracking, payroll, CRM. Note how many people use each, from where and at what times.
- Classify the data. Personal data, special-category data, trade secrets or routine business data. Where personal data is involved, compare the provider's data location against the rules on cross-border data transfer.
- Map the integrations. Which systems does the application talk to? The link between a cloud ERP and a machine on the internal network is often the decision itself. Our guide to how API integration works explains how those links are built.
- Be honest about your operating capacity. On-premise, who will patch, back up and monitor? Without a working patch management process and tested backups, the "control" advantage of on-premise exists only on paper.
- Compare costs over the same horizon. Put the subscription beside licence, hardware, maintenance and staff time over a common period such as five years. We explain how to build these line items in our pieces on software project cost and cloud migration cost.
- Write the exit plan first. When the contract ends, in what format, how quickly and how often will your data be handed over? For on-premise or custom software, settle source code ownership using the clauses in our guide to software contracts and source code.
- Prove it with a pilot. Test the decision with one team and a few weeks of real use. Performance, access and integration problems surface in a pilot, not in a sales demo.
Most organisations end up with a hybrid picture: email and file sharing on SaaS, the machine-connected production system on site, and an integration layer in between.
Which workloads and sectors fit which model?
General tendencies speed up the decision, but watch for exceptions:
- Usually a good fit for SaaS: email, file sharing, team collaboration, CRM and standard HR tools. They need access from anywhere, carry no industry-specific workflow and benefit from continuous provider updates.
- Usually sensible to keep on-premise: systems wired to production lines, PLCs or weighbridges; shipping and labelling stations that must keep working through an outage; applications processing very large data volumes locally.
- Candidates for private cloud or hybrid: business applications written for you, central systems such as ERP for SMEs, and software that branches must reach while the data stays under your control.
The office file server is typically the first workload to move to SaaS; our guide to replacing an on-premise file server covers the folder and permission plan. As the number of applications grows, managing users with one identity matters more, which our piece on single sign-on benefits explores.
How we make this decision with you at Digital Bridge
We do not recommend the same model for every system. We first understand the need, then give a written proposal. The work usually runs like this:
- Discovery and requirements analysis. We map your application inventory, data classes and integration points together; our article on software requirements analysis explains this step. Infrastructure and hosting are assessed under our cloud migration and infrastructure consultancy.
- A model recommendation per application. For each system we set out SaaS, on-premise or private cloud, with the reasoning in writing. Where personal data is involved, data location and transfer basis are handled alongside our data protection compliance team.
- Custom development and integration. Where SaaS products fall short, we build custom web software that can run on your servers or in a data centre you choose. We connect cloud and on-site systems through our API integration services.
- Pilot and roll-out. We test with one team, measure, then widen step by step. On the backup side, backup restore testing goes on the go-live checklist.
You will find related guides on our software development topic page.
Smart360: SaaS email and files with nothing to install
Email and file sharing are where SaaS pays off most clearly. Smart360 is our family of business applications under one panel and one identity, SmartID: business email (SmartMail), document management (SmartFiles), an AI customer agent for websites (SmartOperator) and card access control and time and attendance (SmartPass), with SmartPM for project management and SmartSales for e-commerce also joining the family. Here we focus on email and files. There is nothing to install: the account opens as soon as payment is confirmed, and there is no office server to maintain.
Take an engineering practice that wants to retire both its ageing file server and a self-managed mail server. In SmartFiles, every file uploaded under an existing name is kept as a new version, and earlier versions can be restored; an attachment arriving in SmartMail is saved to a SmartFiles area in one click. Each organisation's data sits in a separate database for each product, with documents and the mail archive held in S3-compatible object storage. When someone leaves, their access closes in a single step.
The same practice can keep its site-specific application, which pulls project costs from the ERP, on its own server. Using SaaS where it fits does not stop you keeping other systems on site.
Next step
List your applications and write the data class and connected systems beside each one. Get in touch with that table, and we will send a reasoned recommendation of SaaS, on-premise or private cloud for each system, together with a written proposal.