Types of IT maintenance

IT maintenance is the set of technical and preventive tasks that ensure a company's systems, devices and networks operate in a stable, secure and efficient way. Far from being an expense, it's an investment: according to industry data, one hour of IT downtime can cost a SME between €300 and several thousand euros, not counting the impact on productivity and reputation.

In this Océano IT guide, we explain the types of IT maintenance that exist, when to apply each one, what tasks they include and how to choose the right one for your company.

What is IT maintenance?

IT maintenance is the set of technical activities aimed at preserving, optimising and repairing an organisation's IT systems: physical equipment (hardware), programs (software), networks, servers and cloud services. Its goal is to prevent failures, minimise downtime and extend the useful life of the technology infrastructure.

This maintenance can be carried out in a planned way (preventive, predictive, evolutionary) or reactively (corrective, emergency), and covers both routine tasks —such as updates or backups— and complex interventions: migrations, audits or infrastructure redesign.

Key fact: according to ICT sector studies, companies that apply a structured preventive maintenance plan reduce their critical incidents by up to 70 % and extend the life of their equipment by 30-40 %.

Why IT maintenance is important for a company

An IT system without maintenance is a ticking time bomb. These are the reasons why any company —regardless of its size— needs a professional maintenance plan:

• Business continuity: avoids unexpected outages that halt billing and daily operations.
• Security: keeps systems updated against vulnerabilities, ransomware and phishing attacks.
• Cost savings: prevention is much cheaper than repair; a critical failure can cost thousands of euros.
• Regulatory compliance: helps meet GDPR, ISO 27001 and other regulations that require infrastructure control.
• Productivity: fast, stable equipment = employees who don't waste time on incidents.
• Hardware lifespan: extends the durability of devices and servers.
• Data protection: guarantees functional, verified backups.

Types of IT maintenance

IT maintenance is classified according to when it is carried out, its purpose and the type of element to which it applies. Understanding the types of IT maintenance is essential to design an effective plan that matches the size and needs of each company.

1. Preventive maintenance

This is the planned, periodic maintenance carried out to prevent failures from occurring. It runs on a schedule (weekly, monthly, quarterly) and includes tasks such as updates, equipment cleaning, log reviews and backup verification.

• When it's applied: before the problem appears.
• Common tasks: installing patches and updates, physical equipment cleaning, hard drive health checks, antivirus reviews, disk space management.
• Advantages: drastically reduces incidents, extends hardware life and lowers costs in the medium term.

2. Corrective maintenance

This is reactive maintenance: it is carried out once a failure has already occurred. It involves diagnosing the problem, repairing it and restoring service as quickly as possible.

• When it's applied: after detecting a fault or incident.
• Common tasks: replacing damaged components, software reinstallation, data recovery, network error resolution.
• Drawbacks: involves downtime and higher costs than preventive maintenance.

3. Predictive maintenance

Predictive maintenance uses continuous monitoring and data analysis (logs, metrics, sensors, AI) to anticipate failures before they happen. It is the natural evolution of preventive maintenance, based on real data rather than fixed schedules.

• When it's applied: continuously, through monitoring systems.
• Common tasks: SMART analysis on disks, performance monitoring, early alerts, trend analysis.
• Advantages: allows intervention just before the failure occurs, optimising costs and avoiding outages.

4. Evolutionary maintenance

Evolutionary maintenance consists of updating and improving systems to adapt them to new business needs or technological changes. It doesn't fix faults: it adds value.

• When it's applied: when the business grows, processes change or new technologies appear.
• Common tasks: cloud migrations, capacity expansion, integration of new applications, functionality improvements.
• Example: migrating from a local physical server to a hybrid cloud infrastructure.

5. Perfective maintenance

Focuses on optimising what already works: improving performance, refactoring code, tuning databases or reorganising infrastructure to make it more efficient.

• When it's applied: when the system works, but it can work better.
• Common tasks: database optimisation, load time improvements, process simplification, refactoring.

6. Adaptive maintenance

Adapts systems to changes in the environment: new operating systems, regulatory changes (GDPR, NIS2), new browsers, cloud provider updates or infrastructure changes.

• When it's applied: in response to an external change that affects the system.
• Example: adapting an application to a new version of Windows Server or to NIS2 regulatory requirements.

7. Emergency maintenance

This is a critical variant of corrective maintenance: it is applied to major incidents that affect the overall functioning of the business (main server outage, cyberattack, massive data loss).

• When it's applied: in emergencies that require immediate 24/7 response.
• Common tasks: incident containment, recovery of critical services, activation of the business continuity plan.
• Critical response time: requires response SLAs of less than 1 hour.

8. Hardware maintenance

Covers all tasks related to the physical part of the system: computers, servers, printers, switches, routers, peripherals and storage devices.

• Common tasks: component cleaning, parts replacement, temperature checks, power supply and UPS reviews, cabling.

9. Software maintenance

Focuses on operating systems, applications and tools: updates, security patches, optimisation, removal of obsolete software and licence management.

• Common tasks: patch deployment, update management, licence control, security policy reviews.

10. Network and communications maintenance

Ensures that the network infrastructure (LAN, WAN, WiFi, VPN) operates with optimal security and performance. It is critical in companies with remote work or multiple sites.

• Common tasks: firewall reviews, VLAN configuration, traffic analysis, switch and AP management, VPN maintenance.

On-site vs. remote IT maintenance

In addition to the types above, maintenance is also classified by how it is delivered:

• Remote maintenance: the technician accesses the equipment through remote control and monitoring tools. It is faster and more cost-effective, ideal for most software incidents, configurations and end-user support.
• On-site maintenance: the technician travels to the client's offices. Essential for hardware faults, physical installations, new deployments or on-site audits.
• Hybrid maintenance: combines both approaches. It is the most common model in companies: most of the support is handled remotely and complemented with periodic visits or in response to major incidents.

What a good IT maintenance plan includes

A professional maintenance plan doesn't stop at "fixing what's broken". These are the services any IT maintenance contract for businesses should include:

• Technical support, both remote and on-site, with defined SLAs.
• Proactive 24/7 monitoring of servers, networks and critical services.
• Backup management and disaster recovery plan (DRP).
• Patch and update deployment on operating systems and applications.
• Managed cybersecurity: antivirus, EDR, firewall, anti-phishing, MFA.
• User and permission management (onboarding, offboarding, access).
• Inventory and control of hardware, software and licences.
• Periodic reports on incidents, performance and proposed improvements.
• Strategic advice and technology consulting.
• Regulatory compliance: GDPR, ISO 27001, NIS2.

How to choose the right type of maintenance for your company

Not every company needs the same level of maintenance. To get it right, consider these key factors:

• Company size: number of users and devices to manage.
• System criticality: does your business stop if the server goes down? You'll need strict SLAs and predictive maintenance.
• Industry sector: regulated sectors (healthcare, finance, public administration) require adaptive maintenance and regulatory compliance.
• Budget: preventive is always more cost-effective than corrective.
• Infrastructure: on-premise, cloud or hybrid; each one requires a different approach.
• Internal capacity: do you have your own IT team or do you need to outsource 100 %?
• Expected growth: growing companies need well-planned evolutionary maintenance.

For most SMEs and mid-sized companies, the most effective approach is a hybrid plan combining preventive + predictive + corrective maintenance, complemented with evolutionary and adaptive services as needed.

Do you need an IT maintenance service for your company? At Océano IT we design tailor-made plans combining technical support, proactive monitoring and managed cybersecurity from our offices in Madrid and Barcelona. Get in touch with our team and we'll advise you with no commitment.

Frequently asked questions about IT maintenance

What's the difference between preventive and corrective maintenance?

Preventive maintenance is carried out in a planned way to stop failures from occurring: regular updates, cleaning, scheduled reviews. Corrective maintenance, on the other hand, is reactive: it kicks in once an incident has already happened and needs to be fixed. Preventive is more cost-effective in the medium term and drastically reduces unplanned downtime; corrective, by its nature, involves downtime and higher costs.

What is predictive maintenance and how does it differ from preventive?

Predictive maintenance uses continuous monitoring, data analysis and artificial intelligence to anticipate failures before they occur. While preventive relies on a fixed schedule (checking the server every month, for example), predictive acts when the data shows something is about to fail: a disk reporting SMART errors, a server whose temperature gradually rises, a service whose performance is degrading. It is more efficient because intervention only happens when truly necessary.

How often should IT maintenance be performed?

It depends on the type of maintenance and the level of criticality: predictive monitoring should be continuous (24/7), security updates are applied monthly or immediately when critical, preventive maintenance on equipment and servers is usually performed every 1-3 months, and in-depth audits at least once a year. The key is to follow a structured plan, not improvised actions.

Does IT maintenance include cybersecurity?

Yes. A modern IT maintenance plan integrates cybersecurity as a fundamental pillar: antivirus and EDR management, patch deployment, firewall configuration, verified backups, MFA, user training and incident response. Maintenance and cybersecurity are inseparable: an outdated device is an open door to cyberattacks.

Is in-house or outsourced IT maintenance better?

It depends on the size and needs of the company. Large corporations usually have in-house IT teams for strategic tasks and outsource specialised services. SMEs and mid-sized companies, on the other hand, often outsource maintenance entirely because it is more cost-effective: they gain access to a multi-disciplinary team (systems, networks, cybersecurity, cloud) without bearing the cost of hiring one in-house. There is also a hybrid option: a small in-house team + outsourced support for peaks and specialities.

What is an SLA in IT maintenance?

An SLA (Service Level Agreement) is the document that defines the maintenance provider's commitments: response and resolution times, coverage hours, guaranteed availability (for example, 99.9 %), penalties for non-compliance, and so on. It is essential in any professional maintenance contract: without an SLA, there are no guarantees.

What's the difference between hardware and software maintenance?

Hardware maintenance deals with the physical part: computers, servers, networks, peripherals, cabling. It includes cleaning, component replacement, thermal checks and UPS reviews. Software maintenance focuses on operating systems and applications: updates, patches, licence management and optimisation. Both are complementary and must be part of a single comprehensive plan.

How much does IT maintenance cost for a company?

The cost depends on multiple factors: number of users and devices, infrastructure complexity, contracted SLA level, services included (cybersecurity, managed backup, 24/7 monitoring) and delivery model (on-site, remote, hybrid). In general, SMEs can find plans starting from scalable monthly fees based on the number of workstations. What matters is not the absolute price but the return: a good maintenance plan pays for itself by preventing a single major incident.

What is adaptive maintenance and when is it needed?

Adaptive maintenance is the type that adapts systems to external changes: new operating system versions, regulatory changes (GDPR, NIS2), cloud provider updates or new security standards. It is needed when the environment changes and existing systems must be updated to remain compatible, secure and compliant with regulations.