Most business owners don’t care what SaaS, PaaS or IaaS stand for.
They just want their systems to work, stay secure, and not cost a fortune.
The problem is, once you start looking at cloud options, it quickly turns into jargon and overcomplication.
This guide breaks everything down in plain English. We’ll explain:
- What each cloud model actually means
- When to use each one
- Where managed IT services fit in
- And how tools like Microsoft 365 tie it all together
If you’re reviewing your IT setup or planning changes this year, this will help you make clearer, more confident decisions.
A simple way to think about your IT setup
Instead of thinking in technical terms, think about how your business actually works day to day.
You have:
- People using systems (your staff)
- Apps they rely on (email, accounting, CRM)
- Devices they work on (laptops, phones)
- Data they need access to
- And a network connecting everything together
If one part of that setup is unreliable or insecure, it affects everything else.
Your cloud decisions should support this whole setup, not complicate it.
The four main types of cloud services (explained simply)
You’ll usually hear four terms when talking about cloud services. Here’s what they actually mean in real terms.
SaaS (Software as a Service)
This is software you simply log into and use.
You don’t install anything, you don’t manage servers, and you don’t worry about updates.
Examples:
- Microsoft 365 (Outlook, Teams, SharePoint)
- Xero or QuickBooks
- Salesforce
- Canva
You manage your users and your data, the provider handles everything else.
👉 For most SMEs, this is the easiest and best starting point.
PaaS (Platform as a Service)
This is for running apps without worrying about servers.
You or your developer build or manage the app, but the platform handles things like:
- Updates
- Scaling
- Performance
Examples:
- Hosting a website or portal in Microsoft Azure
- Running a custom app without managing a server
👉 Ideal if you have custom systems but don’t want server headaches.
IaaS (Infrastructure as a Service)
This is basically renting a server in the cloud.
You still manage:
- The operating system
- Updates
- Your applications
But you don’t have to worry about physical hardware.
Examples:
- Hosting an old business system on a virtual server
- Moving an on-site server into Azure
👉 Useful for legacy systems that can’t move to modern platforms.
On-premises (on-site servers)
This is your traditional setup, where everything lives in your office.
You are responsible for:
- Hardware
- Updates
- Backups
- Security
👉 This still has its place, but it requires the most effort and risk.
What should you actually use in your business?
Most SMEs don’t need to choose just one option. The best setup is usually a mix.
Here’s what that looks like in real life:
- Emails, files and collaboration → Microsoft 365 (SaaS)
- Accounting, CRM, HR systems → Cloud software (SaaS)
- Website or client portal → Cloud platform (PaaS)
- Older business software → Cloud server (IaaS) or kept on-site
- Login and security → Centralised through Microsoft 365
👉 In simple terms, start with SaaS, then only use other options where needed.
Where managed IT services fit in
This is the part most businesses underestimate.
Cloud doesn’t run itself properly without ongoing management.
A managed IT partner handles the day-to-day work that keeps everything running smoothly and securely.
That typically includes:
- Fixing issues before they become problems
- Keeping systems updated and secure
- Managing user access when staff join or leave
- Monitoring backups and making sure they actually work
- Protecting against cyber threats
- Keeping your network stable and fast
👉 This is what turns a “set of tools” into a reliable IT system.
Using Microsoft 365 as your central hub
If you’re already using Microsoft 365, you’re sitting on more value than you might realise.
It can act as the central point for:
- User accounts
- Logins (single sign-on)
- Security policies
- Device management
This means:
- Staff have one login for everything
- You can remove access instantly when someone leaves
- You can add security rules based on location or device
👉 Done properly, this massively reduces risk and admin.
When it still makes sense to keep things on-site
Not everything belongs in the cloud.
You might still keep systems on-site if you have:
- Specialist equipment or machinery
- Very old software that can’t move to the cloud
- Poor internet connectivity at certain locations
If you do keep anything on-site, it’s critical to:
- Back it up properly
- Keep it updated
- Have a recovery plan in place
👉 This is where hybrid setups (cloud + on-site) work well.
What “Microsoft 365 management” actually means
A lot of businesses think Microsoft 365 is a one-time setup.
In reality, it needs ongoing management.
That includes:
- Setting up users and permissions properly
- Keeping security settings up to date
- Managing licences so you’re not overspending
- Structuring Teams and SharePoint correctly
- Monitoring for security risks
- Keeping everything aligned as your business grows
👉 Without this, things become messy, insecure, and expensive over time.
Keeping cloud costs under control
One common misconception is that cloud automatically saves money.
It can, but only if it’s managed properly.
Without oversight, costs can creep up through:
- Unused services
- Over-licensing
- Duplicate tools
- Poor setup choices
A managed approach helps you:
- Only pay for what you actually use
- Consolidate tools where possible
- Avoid unnecessary complexity
- Keep spending predictable
Quick FAQ
What are the four types of cloud services?
SaaS, PaaS, IaaS, and on-premises systems.
What are managed IT services?
Ongoing support that keeps your systems secure, updated, and running smoothly.
What is Microsoft 365 management?
The day-to-day setup, security, and optimisation of your Microsoft 365 environment.
Do I need everything in the cloud?
No. Most businesses benefit from a mix of cloud and on-site systems.
Next step, simplify your setup
If your current IT setup feels messy, overcomplicated, or harder to manage than it should be, you’re not alone.
The right combination of:
- Cloud tools
- Microsoft 365
- And managed support
can make everything simpler, more secure, and easier to scale.
If you’re based in Norwich, Ipswich or across East Anglia, we can review your current setup and show you exactly where improvements can be made.
No pressure, just clear advice you can actually use.