Yes. Most businesses need preventative endpoint controls in addition to endpoint detection and response (EDR), because the two tools do different jobs. EDR watches for suspicious behavior on a device after a process has already started running, then alerts a security team or automatically isolates the machine. It does not stop a malicious file from executing in the first place, block an employee from visiting a phishing site, or close the software vulnerability an attacker used to get in. That job belongs to preventative controls: patching, application control, DNS filtering, email security, and multi-factor authentication (MFA).
Running EDR alone leaves a gap between the moment an attacker gets a foothold and the moment detection triggers a response. For a small accounting firm or healthcare office, that gap is where ransomware encrypts files or a threat actor exfiltrates client records.
Quick Answer
Yes, businesses should pair EDR with preventative endpoint controls rather than rely on either alone. EDR detects and responds to threats already running on a device; preventative controls (patching, application control, email and DNS filtering, MFA, and least-privilege access) reduce how often attackers get that far in the first place. The two layers cover different stages of an attack, and the National Institute of Standards and Technology (NIST) Cybersecurity Framework treats "Protect" and "Detect" as separate, equally necessary functions for this reason.
What EDR Covers, and What It Leaves Open
EDR is software that continuously logs activity on a laptop, server, or workstation, looks for behavior patterns tied to known attack techniques, and gives a response team the ability to isolate or remediate a compromised device. It is strongest in the Detect and Respond functions of the NIST Cybersecurity Framework, a voluntary set of standards published by the U.S. Department of Commerce that organizations use to structure their security programs.
What EDR generally does not do: patch a vulnerable application, stop an employee from running a malicious macro before behavior triggers an alert, filter a phishing email before it lands in an inbox, or enforce MFA on a login. Those are prevention tasks, and they sit in the Framework's Protect function. Several EDR providers price flat monthly packages that bundle in some of this; see which EDR providers offer flat monthly pricing for SMBs if you're comparing options.
What Preventative Controls Add
Preventative controls reduce how often an attacker reaches the point where EDR would even need to respond. The core set for a small business includes:
- Patch management: closing known software vulnerabilities before attackers use them. The Cybersecurity and Infrastructure Security Agency (CISA) maintains a Known Exploited Vulnerabilities (KEV) catalog that tracks flaws actively being used in attacks.
- Email and DNS filtering: blocking phishing messages and malicious domains before an employee can click.
- Application control: restricting which programs can run, which stops unapproved executables regardless of whether EDR flags them.
- Multi-factor authentication (MFA): requiring a second verification step beyond a password. The FTC Safeguards Rule explicitly requires MFA for anyone accessing customer information at financial institutions, including tax preparation firms; see our breakdown of the FTC Safeguards Rule qualified individual requirement.
- Least-privilege access: removing local administrator rights so a compromised user account can't install software or change system settings freely.
None of these controls guarantee that an incident won't happen. They reduce the frequency and severity of incidents by removing easy paths in, which is a meaningfully different claim than "prevents breaches."
Why Layer Both
- Closes the window between initial compromise and EDR detection
- Reduces the volume of alerts your EDR or managed detection and response (MDR) team has to triage
- Covers attack stages EDR doesn't touch, like phishing delivery and unpatched software
- Supports compliance documentation under frameworks like the FTC Safeguards Rule and HIPAA Security Rule
Tradeoffs to Plan For
- More tools to configure, license, and keep updated
- Application allowlisting in particular takes time to tune so it doesn't block legitimate software
- Added monthly cost on top of an EDR subscription
- Still no control or combination of controls eliminates risk entirely
Endpoint Control Checklist
- EDR deployed and actively monitored on every endpoint, including laptops used off-network
- Operating systems and business applications set to patch automatically or on a documented schedule
- MFA enforced on email, remote access, and any system holding client or patient data
- Email filtering in place that blocks known phishing and malware attachments
- Standard users running without local administrator rights
- DNS or web filtering blocking access to known malicious domains
How Bellator Structures This
Bellator Cyber Guard offers two tiers built around this exact layering question. Bellator Shield is managed EDR at $19 per computer per month: a security analyst team monitors alerts and responds to detected threats on your behalf. Bellator Core, at $33 per computer per month, adds remote monitoring and management (which supports the patching and configuration side of prevention) along with Ransomware Rollback®, a feature that can restore encrypted files to their pre-attack state. Compare the two directly on the protection plans comparison page before deciding which fits your office.
If you're still building out the rest of your prevention stack, our guide to small business ransomware protection walks through backups, filtering, and access controls in more detail, and MDR services for small business explains how managed detection and response fits alongside endpoint tools when you don't have in-house security staff.
Key takeaway
EDR and preventative controls answer different questions. EDR asks "is something bad happening right now on this device?" Preventative controls ask "how do we make that question come up less often?" A small business handling client financial or health data needs both, not one in place of the other.
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Frequently Asked Questions
Traditional signature-based antivirus is one preventative control, but it's a narrow one. It catches known malware signatures but generally misses novel or fileless attack techniques, which is part of why it's typically paired with EDR and other prevention layers like patching and MFA rather than used alone.
An endpoint protection platform (EPP) is preventative, blocking known malware and risky behavior before it executes. EDR assumes something will eventually get past prevention and focuses on detecting and responding to it once it's running. Many vendors now bundle both into a single agent, but they remain functionally distinct layers.
The FTC Safeguards Rule, which applies to tax preparers and other nonbanking financial institutions, requires multi-factor authentication for anyone accessing customer information and requires a written risk assessment that would typically cover endpoint protection. It does not name a specific EDR or antivirus product. Review current requirements with your qualified individual or legal counsel, since the Rule's provisions have been phased in over several years.
There's no safe single-layer answer, but if you're starting from nothing, MFA and patch management typically close the most common and cheapest-to-exploit gaps before EDR becomes useful. EDR works best once basic prevention is already reducing the volume of incidents it has to catch.
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