IT Infrastructure Checklist for Growing Businesses

Growth puts pressure on IT in ways that are easy to miss. New employees need accounts and devices, new applications create dependencies, and a second office changes network and support requirements. This checklist gives owners and managers a structured way to review infrastructure before small gaps become expensive interruptions.

1. Devices and lifecycle

• Maintain an inventory of laptops, desktops, mobiles, printers, servers and network equipment.
• Record assigned user, serial number, warranty, purchase date and operating-system support status.
• Define a standard device configuration and a secure process for issuing and returning equipment.
• Plan replacement before devices become unsupported or unreliable.
• Encrypt portable devices where appropriate and define how lost equipment is reported.

Do not treat an asset register as a one-off spreadsheet. Update it when equipment is purchased, reassigned, repaired or retired. Tools such as GLPI or Snipe-IT can help track assets, but they need clear ownership and regular data checks.

2. Network and connectivity

• Document internet circuits, routers, firewalls, switches, access points and support contacts.
• Separate guest Wi-Fi from internal business systems.
• Review firewall rules and remove old exceptions that no longer have an owner.
• Record IP ranges, VLANs, DHCP scopes and DNS dependencies.
• Check wireless coverage and capacity in areas where staff actually work.
• Keep network firmware supported and configuration backups current.

3. Identity and access

• Use individual accounts and multi-factor authentication for important services.
• Review administrator and privileged groups at planned intervals.
• Remove access promptly when a person leaves or changes role.
• Document service accounts, application integrations and emergency access.
• Ensure recovery methods do not depend on one unavailable person.

For Microsoft environments, review Active Directory or Entra ID configuration as applicable, along with Intune device compliance and conditional access where licensed and configured. Avoid assuming that a policy is protecting a device until deployment and reporting confirm it.

4. Applications, cloud services and licences

List the applications used by each team, the business owner, supplier, renewal date, data location and authentication method. Remove unused subscriptions and confirm that critical services have more than one authorised administrator. Review external integrations and API credentials; old integrations can remain active after a project has ended.

5. Servers and hosting

Record each server’s purpose, operating system, owner, location, dependencies, support status and maintenance window. Review CPU, memory and storage trends rather than relying on a single snapshot. Confirm who patches the operating system and applications, who monitors availability and how a failed service is recovered.

For virtualised environments, document hosts, clusters, storage, virtual networks and backup dependencies. A virtual machine is not independent of its host, storage or network. For VPS and cloud workloads, include provider limits, renewal details, access controls and data export options.

6. Backup and business continuity

• Identify business-critical data and agree recovery time and recovery point objectives.
• Check backup success, retention, capacity and protection against deletion.
• Keep backup administration separate from ordinary user access.
• Test restoring files and at least one critical application or system.
• Document the recovery order, key contacts and alternative communication methods.

7. Security monitoring and incident readiness

Decide which events matter: repeated failed logins, privileged group changes, malware detections, unusual endpoint activity, firewall changes or backup failures. Assign an owner to review alerts. Tools such as Wazuh can provide useful central visibility, but they require tuning, maintenance and a defined response process. An alert without an investigator is not an effective control.

8. Documentation and suppliers

Keep a current network diagram, asset register, software and licence list, supplier contacts, administrator access procedure, backup runbook and incident plan. Store documentation securely but make sure authorised staff can access it during an outage. Record significant changes and the reason they were made.

Quarterly infrastructure review scorecard

Area	Evidence to check	Owner
Devices	Inventory accuracy and supported operating systems	IT / operations
Identity	MFA coverage and privileged-access review	IT / security
Network	Current diagram, firmware and firewall review	IT / provider
Backups	Recent successful restore test	Service owner
Suppliers	Renewals, contacts and contract scope	Management

Turn findings into a manageable plan

Do not try to fix every item at once. Rate each gap by business impact, likelihood and effort. Address exposed administrator access, failed backups and unsupported critical systems before cosmetic improvements. Assign an owner and due date, then review progress at the next quarterly meeting.

Frequently asked questions

How often should a growing business review IT?

Check operational alerts continuously, review access and backups regularly, and complete a structured review at least quarterly. Repeat it after major changes.

What is the most important first step?

Identify critical services and who owns them. Without that information, it is difficult to prioritise security, recovery or spending.

How SmartSite can help

SmartSite helps businesses across Ireland assess and improve infrastructure, server and cloud platforms, security and connectivity, and IT asset management. Explore IT infrastructure services or contact SmartSite to discuss a review.

Simple prioritisation method

Not every gap deserves the same urgency. A useful review scores each finding by business impact, likelihood and how quickly it can be corrected. An exposed administrator interface, failed backup or unsupported internet-facing server should normally be addressed before a cosmetic dashboard improvement. A missing asset owner may be less urgent, but it still needs an agreed date and person responsible.

Keep the improvement register short enough to maintain. For each action record the issue, risk, recommended change, owner, due date, dependencies and evidence that the work is complete. Review overdue high-risk items with management so that accepted risks are explicit decisions rather than forgotten tasks.

Evidence to keep after the review

Save the current network diagram, device inventory export, access review, backup test result and list of unsupported systems. Record the date and scope of the review, who participated and any limitations. This evidence helps the next review compare progress and prevents the organisation from repeating discovery work.

Make the checklist actionable

Use a simple status for each item: compliant, needs attention, not applicable or not yet checked. Avoid marking a control as complete based only on a policy document. For example, “backups configured” should be supported by recent job results and a restore test. “MFA enabled” should be checked against actual user and administrator accounts, including emergency access.

Where evidence is unavailable, record the gap rather than assuming the control exists. This makes the review honest and gives management a realistic view of risk.