Antivirus vs managed security: what's enough?

For a solo operator or a very small team with simple needs, good antivirus plus MFA and backups may be enough. Once you have staff, client data and more than a handful of devices, managed security is the better value, because someone is actively watching and responding, not just scanning. For most growing small businesses, that tipping point arrives around five to ten staff.

Antivirus and managed security are not really the same category, which is where the confusion starts. One is a tool. The other is an ongoing service that includes tools plus people. Here is an honest comparison so you can spend on what you actually need.

What is antivirus, and who is it enough for?

Antivirus is software that scans your devices and blocks known malware, and on its own it suits very small, simple operations. If you are a sole trader with one or two devices, little sensitive data, and you have already turned on MFA and backups, modern antivirus (including the protection built into Windows) covers a lot of ground. The trade-off is that it only reacts to threats it recognises, and nobody is watching if something slips through.

Note: Antivirus tells you something went wrong; it does not act on it, so on its own it depends on someone noticing and responding in time.

What is managed security, and who is it for?

Managed security is an ongoing service where a team sets up your protection, monitors it, and responds when something happens. It suits businesses with staff, client data, or compliance obligations, because the value is the human response, not just the software. If an account is compromised at 9pm, the difference between an alert nobody reads and someone acting on it can be your whole week.

Best practice: Turn on the free essentials, MFA, automatic updates and tested backups, before paying for anything else, since they block the most common attacks at no cost.

It usually bundles the essentials together: antivirus, MFA, patching, backups and monitoring, which is why it maps neatly onto the cyber security essentials every growing business needs.

What does each really cost?

Antivirus is cheap per device, while managed security is a larger monthly cost that buys you time and expertise you would otherwise not have. Antivirus commonly runs $3 to $10 per device per month. Managed security is more like $30 to $80 per user per month, but it replaces the hours you would spend, or the incident you would suffer, doing it yourself.

Tip: Compare the monthly managed security fee against a single day of downtime or one recovered ransomware incident, and the larger line item usually looks cheap.

Which should you choose?

Choose based on how much you would lose if something went wrong and how much time you have to manage it yourself.

• Choose antivirus alone if you are a solo operator or tiny team, hold little sensitive data, and have already sorted MFA and backups.
• Choose managed security if you have staff, hold client data, face compliance requirements, or simply don't want security to be your job.
• In between? Start with the free essentials (MFA, updates, backups) and add managed security when your team or your risk grows.

There is no shame in the simple option while you are small, that is the honest answer. When you outgrow it, our managed cyber security service is built for exactly this stage, and tightening up Microsoft 365 is often where it starts.

Frequently asked questions

Is antivirus enough for a small business?

For a solo operator with a simple setup and MFA and backups already in place, antivirus can be enough. Once you have staff and client data, managed security offers much better protection.

What is the difference between antivirus and managed security?

Antivirus is software that blocks known threats. Managed security is an ongoing service that includes tools plus a team who monitor and respond, covering MFA, backups and updates too.

Is Windows Defender good enough?

The built-in protection in Windows is genuinely capable and fine for many small setups when paired with MFA and backups. It does not, however, replace someone monitoring and responding for you.

How much does managed security cost for a small business?

Commonly $30 to $80 per user per month, depending on what is included. It bundles protection, monitoring and response that would take real time to run yourself.

Can I start small and upgrade later?

Absolutely. Turn on the free essentials now (MFA, updates, tested backups) and move to managed security when your team or risk grows. Nothing is wasted.

Not sure which side of the line your business sits on? Take the free business health check, or book a chat about managed security, and we will give you a straight answer.