Buy the tool and run it yourself, or buy the tool with a team attached? That's the real EDR decision, and it's mostly not about the tool. Endpoint detection and response (EDR) is software; managed detection and response (MDR) is the analysts who watch it. Whether you need to buy that watching, or can do it yourself, comes down to staffing, hours and how honestly you assess your own capacity.

This guide defines both briefly, lays out your three operating models, and walks through how to choose. For a deeper feature-level comparison of EDR, MDR and XDR, see our EDR vs. MDR vs. XDR breakdown.

What is EDR?

EDR is software installed on your laptops, desktops and servers that continuously records what happens on them: processes starting, files changing, network connections, user logons. It applies detection logic to that telemetry and gives analysts the tools to investigate and respond.

Core capabilities:

  • Behavioral detection that watches what a process does, not just whether it matches a known signature
  • A searchable history of endpoint activity for investigations
  • Response actions such as isolating a host, killing a process or quarantining a file
  • Threat hunting across all enrolled endpoints

The crucial word above is analysts. EDR produces alerts and gives someone the means to act on them. It does not supply the someone.

What is MDR?

MDR is a service, not a product: a provider's analysts monitor your environment around the clock, investigate alerts, and take agreed response actions on your behalf. Most MDR is delivered on top of EDR — sometimes the vendor's own, sometimes one you already own.

A typical MDR service covers:

  • 24/7 monitoring and alert triage by human analysts
  • Investigation to confirm whether an alert is real and how far it reached
  • Threat hunting for activity that didn't trigger an alert
  • Response actions within limits you agree in advance
  • Reporting and guidance on fixing root causes

In short: EDR is the instrument, MDR is the person watching the instrument at 3 a.m. on a Sunday.

Your three options

Once you decide you need detection and response on endpoints, there are three ways to operate it:

Run EDR yourself EDR + MDR service In-house SOC
Who watches alerts Your IT or security staff, during their working hours The provider's analysts, 24/7 Your own analysts, on shifts
After-hours coverage None unless someone is on call Included by definition Requires 3–5+ analysts to sustain
Tuning and maintenance Your team Shared with the provider Fully yours
Cost profile License plus hidden staff time Predictable per-endpoint fee Highest: salaries, tooling, training, retention
Control and visibility Total Shared; depends on contract terms Total
Realistic for Teams with at least one dedicated security person Most small and mid-sized organizations Larger organizations with regulated or unusual needs

Most organizations reading this are choosing between the first two columns. The third — building your own security operations center — only makes sense once you can staff and retain several analysts, which puts it out of reach for most companies under a few hundred employees.

What "running it yourself" really involves

Buying EDR licenses is the easy part. Operating the tool is a job — several jobs, actually:

  • Alert triage. Even a well-tuned EDR generates daily alerts. Each one needs someone to decide: real or noise, and if real, how far did it go?
  • Detection tuning. Out-of-box detections fire on your admin tools, your backup software and your developers' scripts. Someone has to tune that out without tuning out real attacks.
  • Response. Isolating a host at 2 p.m. is easy. Isolating the CFO's laptop, or a production server, takes judgment and pre-agreed authority.
  • On-call coverage. Attacks don't respect business hours. True 24/7 coverage means roughly three to five analysts once you account for shifts, weekends, holidays and turnover.
  • Skill maintenance. Detection is a perishable skill. Your team needs training time and exposure to current attacker techniques to stay sharp.

If you have one IT generalist and no dedicated security staff, "we'll run it ourselves" usually means "the console will email someone who is busy." An unwatched EDR still records everything — it just means you get a detailed forensics report after the incident instead of a chance to stop it.

What you trade away with MDR

MDR solves the staffing problem, but it isn't free of trade-offs:

  • Response authority. The provider acts under limits you set. Too tight and containment waits for your approval; too loose and a production system might get isolated at a bad moment. Either way, the decision framework is yours to define.
  • Depth of context. An external analyst doesn't know that your bookkeeper always logs in at odd hours at month-end. Good providers learn your environment; weak ones treat you as an alert queue.
  • Visibility. Some providers give you full access to the underlying console and data. Others give you a monthly PDF. Insist on the former.
  • Data ownership and exit. Telemetry, detection content and incident history should remain yours and exportable if you switch providers.

None of these are reasons to avoid MDR. They're reasons to choose the provider carefully and put the terms in writing.

How to choose

Four factors usually settle it.

Do you have dedicated security staff?

Not IT generalists — people whose job is security. If the answer is no, running EDR yourself is a plan to ignore it, and MDR is the realistic option. If you have one or two security people, a common split is MDR for 24/7 monitoring with your staff handling remediation and oversight.

What does 24/7 coverage cost you either way?

Compare the MDR quote against the fully-loaded cost of the analysts needed to cover nights and weekends yourself, not against zero. Three to five salaries buys a lot of MDR. For most small and mid-sized organizations, the service wins on cost before you count anything else.

What are compliance and insurance expecting?

PCI DSS, HIPAA, SOC 2 and most cyber insurance applications ask about monitoring, log review and incident response capability. An MDR service produces this evidence almost by default. Self-managed EDR can satisfy the same requirements, but you carry the burden of proving it's actually being watched.

How mature is your IT operation?

Detection and response sits on top of fundamentals: patched systems, managed identities, working backups. If those aren't solid, fix them first — detection on top of unmanaged IT is an alarm system on a house with no locks. Our MSP vs. MSSP comparison covers how to split IT operations from security operations if you're deciding both.

Questions to ask before buying

Use these with MDR providers and with EDR vendors selling their own managed service. Vague answers are a signal in themselves.

  1. Are the analysts your own staff, and is the service really 24/7?
  2. Can you work with the EDR we already have, or must we switch to yours?
  3. What response actions will you take without asking first, and how do we set those limits?
  4. What are your committed times to detect, notify and respond, and how are they measured?
  5. What visibility do we get: full console access, dashboards, or just reports?
  6. Is incident response included when something serious happens, or billed separately?
  7. How do you tune detections to our environment, and how do you handle false positives?
  8. Who owns our telemetry and detection content, and what do we keep if we leave?

Whatever you choose, write down who does what when an alert fires — including the handoff between the provider and your own team. A tested incident response plan is where that gets settled before it matters.

If you want senior guidance on structuring this decision, our virtual CISO (vCISO) advisory service can help.

Frequently asked questions

Can we start self-managed and add MDR later?

Yes, and many organizations do. Run your EDR in-house while you learn what normal looks like, then hand monitoring to an MDR provider when alert volume or after-hours risk outgrows your team. Choose an EDR that third-party MDR providers support so you don't have to switch tools later.

Is MDR worth it if we already own EDR licenses?

Usually, yes. Owning EDR without people to watch it means you find out about incidents after the fact. Many MDR providers work with the EDR you already have, so the license spend isn't wasted — the MDR fee buys the analysts you don't employ.

What's the difference between MDR and an MSSP?

Traditional MSSPs manage security devices and forward alerts; MDR providers investigate and respond, typically on top of EDR or XDR tooling. The labels overlap heavily in the market now, so compare what each provider actually does after an alert fires rather than the acronym on the website.

Key takeaways

  • EDR is the tool; MDR is the team that watches it. You need both functions from somewhere.
  • Running EDR yourself means staffing triage, tuning, response and on-call coverage — not just buying licenses.
  • True 24/7 in-house coverage takes three to five analysts; below that, MDR usually wins on cost.
  • With MDR, negotiate response authority, console visibility and data ownership up front, in writing.
  • If you're unsure, start with MDR and bring monitoring in-house later if your team grows into it.