The Guide to Backup-as-a-Service (BaaS) for SMEs

The Guide to Backup-as-a-Service (BaaS) for SMEs

Data loss is one of the most devastating events that can befall a small or medium-sized enterprise. Whether it's caused by ransomware, hardware failure, human error, or a natural disaster, the consequences can be severe — from operational paralysis and financial loss to regulatory penalties and reputational damage. Yet many UK SMEs still rely on outdated, untested, or inadequate backup solutions that would fail them when they need them most.

Backup-as-a-Service (BaaS) offers a modern alternative. Instead of managing your own backup infrastructure — purchasing hardware, configuring software, managing tapes or disk arrays, and hoping that your backups actually work — BaaS providers handle everything for you. Your data is backed up automatically to secure, offsite cloud storage, monitored around the clock, and recoverable at the click of a button.

This guide explains what BaaS is, how it differs from traditional backup approaches, what to look for when selecting a provider, and how to ensure your BaaS solution meets UK compliance requirements.

What Is Backup-as-a-Service?

Backup-as-a-Service is a cloud-based approach to data protection where a third-party provider manages the entire backup process on your behalf. Rather than purchasing, installing, and maintaining your own backup hardware and software, you subscribe to a service that automatically backs up your data to secure cloud storage according to a defined schedule and retention policy.

The "as-a-Service" model means you pay a predictable monthly or annual fee based on the amount of data you need to protect, rather than making large upfront capital investments in backup infrastructure. The provider handles all the complexity — software updates, storage management, monitoring, and alerting — leaving you free to focus on your business.

How BaaS Differs from DIY Backup

Key Components of a BaaS Solution

A comprehensive BaaS solution typically includes several key components that work together to protect your data.

Backup Agent Software

A lightweight software agent is installed on each server, workstation, or device that needs to be backed up. This agent handles the actual backup process — identifying changed data, compressing and encrypting it, and transmitting it to the cloud storage. The agent typically runs in the background with minimal impact on system performance, scheduling backups during off-peak hours to avoid disrupting business operations.

Cloud Storage Infrastructure

Your backup data is stored in secure, geographically redundant cloud storage. Reputable BaaS providers store data in UK data centres with appropriate certifications (ISO 27001, SOC 2) and replicate data across multiple availability zones to protect against data centre failures. The storage is encrypted both in transit (using TLS) and at rest (using AES-256 encryption), ensuring your data remains protected throughout its lifecycle.

Management Portal

A web-based management portal gives you visibility over your backup environment. You can see the status of all backups, review backup history and retention, initiate restores, configure backup policies, and generate reports. The best portals also provide automated alerting — sending email or SMS notifications if a backup fails, if a device hasn't been backed up within the expected timeframe, or if storage usage approaches defined thresholds.

Pricing Models for BaaS

BaaS providers use several different pricing models. Understanding these helps you compare providers on a like-for-like basis and avoid unexpected costs.

Pricing Model	How It Works	Pros	Cons
Per Device	Fixed monthly fee per server or workstation	Predictable costs, easy to budget	May include storage limits per device
Per GB	Charged based on total data stored in cloud	Only pay for what you use	Costs can grow unpredictably as data increases
Per User	Monthly fee per user, covering all their devices	Simple to manage, covers multiple devices	May be expensive for users with large data volumes
Tiered	Predefined packages with set storage and device limits	Clear pricing, no surprises	May pay for unused capacity within tier

Provider Selection Criteria

Choosing the right BaaS provider is a critical decision. Not all providers are equal, and selecting the wrong one could leave you with inadequate protection when you need it most. Here are the key criteria to evaluate.

Data Centre Location and Sovereignty

For UK businesses, data sovereignty is a crucial consideration. Ensure your BaaS provider stores data in UK data centres. Under UK GDPR, you must know where your data is being processed and ensure adequate protections are in place. While data can be stored in the EU or other adequate jurisdictions, keeping your backups in the UK simplifies compliance and ensures that your data is subject to UK law.

Recovery Time and Recovery Point Objectives

Two critical metrics define the quality of any backup solution: Recovery Time Objective (RTO) — how quickly can you get your systems back up and running after a failure? Recovery Point Objective (RPO) — how much data can you afford to lose? If your RPO is one hour, your backups must run at least every hour. If your RTO is four hours, your provider must be able to restore your systems within that timeframe.

Security and Encryption

Your backup data often contains some of your most sensitive information — customer records, financial data, employee details, and business-critical documents. The BaaS provider must encrypt data both in transit (TLS 1.2 or higher) and at rest (AES-256). Ideally, you should hold the encryption keys, so that even the provider cannot access your data without your authorisation. This is particularly important for organisations in regulated sectors.

Compliance Certifications

Look for providers that hold relevant certifications: ISO 27001 for information security management, SOC 2 Type II for service organisation controls, Cyber Essentials Plus for UK cybersecurity standards, and any sector-specific certifications relevant to your industry. These certifications provide independent verification that the provider meets recognised standards for security, availability, and data protection.

SLAs to Look For

A Service Level Agreement (SLA) defines the provider's commitments regarding service quality, availability, and support. A robust SLA should cover several key areas.

Backup Success Rate

The provider should commit to a minimum backup success rate — typically 99% or higher. This means that at least 99% of scheduled backup jobs should complete successfully. The SLA should also define how quickly failed backups are detected, reported, and retried.

Recovery Time Guarantees

The SLA should specify maximum recovery times for different types of restore — individual file recovery, full system recovery, and bare-metal recovery. These commitments should be tested and verified as part of your regular backup testing programme.

Support Response Times

When something goes wrong with your backups — or worse, when you need to perform an emergency restore — you need fast, competent support. The SLA should define response times for different severity levels, typically ranging from 15 minutes for critical issues (backup system completely down or emergency restore required) to 4 hours for low-priority queries.

Compliance Considerations for UK Businesses

UK businesses must consider several compliance requirements when implementing BaaS.

UK GDPR

Your BaaS provider is a data processor under UK GDPR, which means you must have a data processing agreement (DPA) in place that defines how they will handle your data. The DPA should cover the types of data being processed, the purposes of processing, security measures in place, sub-processor arrangements, data breach notification procedures, and data deletion upon contract termination. The ICO provides guidance on what a data processing agreement should contain, and your BaaS provider should be able to provide their standard DPA for review.

Data Retention

Your backup retention policy must align with your data retention obligations. Some data must be retained for specific periods (for example, financial records for six years under HMRC requirements), while other data should be deleted when it is no longer needed (in accordance with GDPR's data minimisation principle). Your BaaS solution should support flexible retention policies that allow you to define different retention periods for different types of data.

Right to Erasure

GDPR gives individuals the right to request deletion of their personal data. This creates a challenge for backups — if you delete someone's data from your live systems but it still exists in your backups, are you compliant? The ICO has acknowledged that it is generally not practicable to delete individual records from backup archives, provided that the data would be deleted if the backup were ever restored. However, you should document this approach in your data protection policy and ensure that your BaaS retention periods are not excessively long.

What to Back Up

A comprehensive BaaS solution should protect all your critical data and systems. For most UK SMEs, this includes file servers and shared drives containing business documents, email (Microsoft 365 mailboxes, shared mailboxes, and archives), databases (SQL Server, MySQL, PostgreSQL), application data from line-of-business systems, Active Directory and Group Policy, server system state for bare-metal recovery, and endpoint data on laptops and workstations.

Don't forget Microsoft 365 data. Many businesses assume that Microsoft backs up their 365 data — but Microsoft's native retention capabilities are limited and not designed as a backup solution. A dedicated Microsoft 365 backup, covering Exchange Online, SharePoint Online, OneDrive, and Teams, is essential for comprehensive protection.

Testing Your Backups

A backup that has never been tested is not a backup — it's a hope. Regular testing is essential to ensure that your BaaS solution will actually deliver when you need it.

Schedule quarterly restore tests, varying the type of restore each time — individual files one quarter, a full system the next, a bare-metal recovery the quarter after that. Document the results of each test, including the time taken to restore, any issues encountered, and any changes needed to the backup configuration. Share the results with stakeholders to demonstrate that your data protection is working as expected.

Your BaaS provider should support and facilitate these tests, providing assistance with more complex restore scenarios and helping you refine your recovery procedures based on test results. Providers who are reluctant to help with testing — or who charge excessive fees for restore tests — should be viewed with suspicion.