Business Central hosting: SaaS, partner cloud or on premise

Asking about Business Central cloud usually means one of three things: use the software as a service run by Microsoft, have a partner host it for you, or install it on your own servers. The choice shapes your update routine, how far you can customise, where your data sits and who is on the hook when something fails. It deserves a decision before the project starts, not after the first quote.

This page sets out the three hosting models for a UK business, what each means in practice for finance and IT, and a simple way to choose. For the wider picture, start from our Microsoft Dynamics 365 Business Central overview.

The three ways to host Business Central

1. Business Central online (SaaS run by Microsoft)

Business Central online is Microsoft's cloud ERP for small and medium-sized organisations. It is built as a multi-tenant service made of microservices running on Microsoft Azure, with Azure SQL Database holding the data of each environment. When people talk about Business Central SaaS, this is the model they mean.

You do not buy servers, patch a database or manage a backup schedule. You get a tenant, create environments in it, and your integrator configures the system for you.

2. Partner-hosted cloud

Some integrators and hosting providers run Business Central on infrastructure they operate and sell it to you as a managed service. The commercial terms, the hosting location, the support hours and the backup arrangements are whatever that provider contracts to deliver, so they differ from one offer to the next. Treat it as a service-level discussion, not a product feature.

If a partner proposes this route, ask in writing where the data is stored, how backups are taken and tested, who applies updates and when, and what happens to your data if you leave.

3. On premise (your own servers)

With Business Central on premise, the software runs on infrastructure you control, in your own server room or in a data centre you rent. You become responsible for the servers, the database, security patches, backups, availability and upgrades. That can make sense for specific constraints, but it is a heavier commitment than most SMEs expect.

How the models compare

Read the table as a starting point. The right-hand column hides the most work, and the middle column hides the most variation.

Features, customisation and apps

Customisation is where the models diverge most. Business Central is extended through extensions, and the online service is designed around them. On premise, the picture is narrower: you cannot upload per-tenant extensions or install Marketplace apps through the Extension Management page, and that applies to Docker deployments too.

For a UK company, this matters more than it first appears. Many of the add-ons that finance and operations teams rely on, such as connectors, reporting tools and sector extensions, are distributed as apps. If your shortlist depends on them, the hosting model is effectively decided for you. Our page on customisation and development in Business Central explains how extensions are built and why they keep upgrades simpler, and the page on integrations covers the connectors you are likely to need.

The editions do not change this reasoning. Essentials and Premium both include customisation and extensibility, multiple environments and multiple companies; only Premium adds service orders and manufacturing. Which edition you choose is a separate question, covered on the versions and editions page.

Updates and running the system

With the online service, Microsoft operates the platform. That removes a category of work that on-premises customers carry themselves: sizing and renewing servers, applying database and operating-system patches, planning upgrade windows. Your team still has responsibilities, such as testing your extensions and workflows before changes reach production, and that is what the sandbox environments are for.

On premise, nothing happens unless somebody schedules it. Teams that host themselves tend to postpone upgrades because each one means effort and risk, and the gap grows until an upgrade becomes a migration. If you go this way, agree who owns the upgrade calendar and budget for it, and see our guidance on support and maintenance for what an integrator can take over.

Environments and limits

Business Central online gives you more than a single system to log in to. Premium and Essentials subscriptions include one production environment and three sandbox environments at no extra charge. Each additional production environment is bought through a CSP partner and brings three more sandboxes and extra database capacity.

In practice a UK business can keep a sandbox for testing customisations, another for training new users and another for trying an upgrade, while production stays untouched. That discipline is harder to reproduce on premise, where every extra environment is another server or database to look after.

The service also has operational limits. A single online environment is limited to 300 companies and to 3 TB of compressed data. These are generous for most SMEs, but a group with many entities or heavy transaction history should check them with the integrator.

Data location and UK data protection

For most finance directors, the first question about the cloud is where the data goes. Microsoft states that the data of UK customers of Business Central online is stored in data centres in the United Kingdom, in the Azure geography called United Kingdom.

Two details deserve attention:

• The country chosen at creation decides the location. The country selected when an environment is created determines the application localisation and the Azure region where it is created and stored. A second environment in the same tenant created for another country is hosted in that country's data centres, often outside the UK.
• Crown Dependencies use the GB base. Guernsey, the Isle of Man and Jersey use the "GB" base app, localised by partners, with the United Kingdom Azure geography.

Because personal data is involved, whether employee records or customer contacts, your obligations under UK GDPR and the Data Protection Act 2018 still apply whatever the hosting model. The cloud does not remove them; it changes who operates the infrastructure and what you must document about it. Your data protection lead or accountant should review the processing arrangements, and the integrator should be able to explain which environments exist and where each one sits. Payroll data is a typical example, as the payroll and HR page explains.

Business Central is localised directly by Microsoft for the United Kingdom, so UK-specific features come with the product. Details of that fit are on the page about Business Central in the UK.

Backups, availability and resilience

In the online service, backups are built in. Production and sandbox environments are backed up automatically and the backups are kept for 28 days. An administrator can restore an environment to any moment in those 28 days, and can recover a deleted environment within 14 days.

Availability is also covered. Azure availability zones are enabled for all paid production environments, and each environment has automatic geo-redundant backups within the same Azure geography. Microsoft financially guarantees 99.9% availability for paid production environments, with compensation if it fails to meet that commitment.

Two cautions are worth stating. First, a restore capability is not the same as a recovery plan: someone in your business should know who is allowed to restore, what a typical reason would be and who must approve it. Second, keep a copy of what matters to your auditors and your accountant, such as exports of ledgers and VAT-relevant reports, according to your own retention policy.

With a partner-hosted or on-premises model, none of these protections come automatically. Ask how often backups run, where copies are held, whether restores are tested and how fast you could be working again after an incident. A provider that cannot answer clearly has answered the question.

Cost: what really changes

Hosting changes the shape of the cost more than the total. Online is a subscription per user: Microsoft's published pricing lists Essentials, Premium and Team Member licences, and notes that the price shown can differ by currency, country and regional variant, with the final price displayed at checkout. Our Business Central pricing page explains how to read it for a UK budget in pounds sterling.

On premise, licences are only part of the cost. Add servers or rented capacity, database licensing and administration, security, monitoring, backups, upgrade projects and the staff time to keep it all running. Partner-hosted offers sit in between, and the useful comparison is the total over several years, not the first-year invoice.

How to choose

A few questions settle most cases:

1. Do you depend on add-on apps? If yes, online or a partner-hosted setup that supports them is the natural choice.
2. Do you have an IT team that wants to run infrastructure? Few SMEs do, and fewer want to carry the upgrade burden.
3. Is there a firm reason to keep the system on your own premises? A genuine constraint, contractual, sectoral or connected to a specific piece of equipment, can justify it. A general preference for control rarely does.
4. Where must the data be? Confirm the Azure geography for each environment, including those created for other countries.
5. Who will own the system after go-live? Support, upgrades and user training all need a named owner.

For most UK SMEs, the online service is the simplest answer, and a partner-hosted or on-premises model needs a reason that can be written down. The answer also depends on your sector: a manufacturer with shop-floor equipment, for instance, will ask different questions from a professional services firm. Our page on Business Central by industry can help frame them.

If you are still deciding between products, compare Business Central with the options on the alternatives page, and read our guide to cloud and on-premise ERP for the general trade-offs.

Moving to the cloud, or planning the first step

If you already run an older system, hosting is part of the migration plan, not a separate topic. Decisions about data cleansing, which history to bring across, and how customisations are rebuilt as extensions all depend on the target. See migration to Business Central and the implementation approach for how projects are sequenced.

ERP Integrator is a free service that puts you in touch with an integrator suited to your project in the UK. We do not run the project, and we are not affiliated with Microsoft. Tell us how you want to host the system, or that you are undecided, and the integrators we introduce can give you their view on the options. How the matching works is explained step by step, and if you are still learning how to pick a partner, read about choosing a Business Central partner.

Software names mentioned are trademarks of their respective publishers and are referred to for information only. This site is independent and is not affiliated with any software publisher.