BarracudaOne: How AMVIA Keeps Your Business Compliant and Protected

Why do businesses add BarracudaOne to Microsoft 365?

Microsoft 365's built-in email security — Exchange Online Protection plus Defender for Office 365 — is a strong baseline that suits many businesses. The gaps appear at the edges: advanced targeted phishing, legally defensible archiving, email continuity during a Microsoft outage, and backup that meets regulated-industry recovery rules.

BarracudaOne is Barracuda Networks' unified email security and data protection platform. AMVIA deploys it for organisations that need capabilities beyond Microsoft's native tooling, or that carry compliance obligations requiring independent archiving and continuity. It sits alongside our wider Microsoft 365 security and managed cybersecurity services, not as a replacement for them.

The UK threat picture justifies the second layer. The NCSC reports that phishing remains the most common entry point for attacks against UK organisations, and that credential-harvesting and business email compromise continue to rise (NCSC). One platform Microsoft tracked blocked roughly 13 million phishing emails in a single month in 2025 — a reminder that volume alone defeats signature-only filtering.

What does BarracudaOne actually include?

BarracudaOne bundles four capabilities into one managed platform: advanced email security, independent archiving, email continuity, and Microsoft 365 backup. Each addresses a specific weakness in a Microsoft-only setup, and AMVIA configures only the modules your compliance and risk profile actually need.

Advanced email security

BarracudaOne's email security layer processes inbound mail before it reaches Microsoft's filtering stack, then hands it on to Exchange Online. That layered position is the point — threats that slip past one engine get a second inspection. It provides:

• AI-driven phishing and impersonation detection — machine learning that spots targeted spear-phishing and Business Email Compromise (BEC) attempts which evade signature-based filters
• Link protection — real-time URL scanning and click-time rewriting across desktop and mobile clients
• Attachment sandboxing — detonates suspicious attachments in isolation to block zero-day malware
• Account takeover protection — watches mailbox behaviour for compromise signals (unusual sending patterns, new mail rules, forwarding rules) and alerts administrators
• Outbound filtering — stops a compromised account spamming from your domain, protecting your sending reputation

This complements, rather than duplicates, Microsoft Defender for Business and our dedicated phishing protection service.

Email archiving

BarracudaOne provides a tamper-proof, cloud-based archive that captures every inbound and outbound email — including deleted messages — in a legally defensible format. It is independent of Microsoft's mailbox and retention policies, so data survives even if a user deletes an email, an account is removed, or a Microsoft licence lapses.

• Indefinite or policy-configurable retention
• Tamper-proof — users cannot alter or delete archived mail
• Full-text search across the entire archive
• Legal hold and eDiscovery export
• Direct access for compliance and legal teams without IT involvement

For UK firms in financial services, legal, healthcare and insurance — where email records must be retained for years and produced on request — independent archiving is the primary reason to deploy BarracudaOne. The ICO sets the wider data-protection expectations these controls support (ICO).

Email continuity

If Microsoft 365 has an outage, BarracudaOne's continuity service spins up a temporary webmail interface so staff keep sending and receiving using the archive as a live mailbox. When Microsoft 365 returns, mail sent during the outage synchronises automatically. Microsoft 365 outages are rare but real, and for a firm where an hour of email downtime stalls transactions, continuity is cheap insurance.

Microsoft 365 backup

BarracudaOne automates backup of Exchange, SharePoint, OneDrive and Teams, giving the point-in-time recovery Microsoft's recycle bin and version history do not. Backups run daily and recovery works at item level (a single email, file or Teams message) or at mailbox/site level. This matters because Microsoft operates a shared-responsibility model — protecting the platform, while your data remains your responsibility (Microsoft Learn). For a deeper look, see our Microsoft 365 backup guide.

BarracudaOne versus native Microsoft 365 tools

The two are complementary. Microsoft 365 secures the Microsoft ecosystem in real time; BarracudaOne adds independent archiving, continuity and backup that keep working regardless of what happens to your tenant. The table below shows where each lands.

Who is BarracudaOne designed for?

BarracudaOne suits organisations whose compliance, continuity or risk profile outgrows Microsoft's native tooling. It is not for everyone — many SMEs are well served by Business Premium alone — and AMVIA will tell you plainly when you do not need it.

• Regulated businesses — financial services, insurance, legal and healthcare with documented retention and discovery requirements
• Firms that have suffered email compromise — and want a second layer beyond EOP and Defender
• Organisations with data-sovereignty needs — Barracuda offers UK/EU data-residency options
• Continuity-critical firms — where email downtime creates immediate commercial or contractual risk

These needs often sit alongside broader obligations covered in our GDPR and cybersecurity compliance guidance, and our wider email security work.

How do BarracudaOne and Business Premium work together?

They are complementary, not redundant. Microsoft 365 Business Premium — list price £16.90 per user per month ex VAT on an annual plan (Microsoft) — provides Defender for Office 365 threat protection inside the Microsoft ecosystem. BarracudaOne adds independent archiving, continuity and backup that remain functional whatever happens to the tenant.

AMVIA typically recommends Business Premium as the foundation, with BarracudaOne added where compliance or continuity requirements justify it. We deploy and manage the whole stack as a single accountable service, and as a Microsoft Solutions Partner holding Cyber Essentials Plus, we configure it to a documented standard rather than out of the box.