Preventive and corrective maintenance: the difference and how they work together

What preventive maintenance is

Preventive maintenance is the periodic check carried out without waiting for anything to fail: confirming backups complete correctly, that devices have updates installed, that server performance is not slowly degrading.

The logic is simple: spending an hour a month reviewing a server is far cheaper than losing a whole day of company-wide work when that server goes down without warning.

Ten examples of preventive maintenance

These are tasks we routinely carry out during our clients’ scheduled reviews, before they turn into a breakdown:

• Checking that last night’s backup finished correctly and can be restored
• Installing operating system and application security updates outside working hours
• Reviewing free disk space on servers and workstations before it runs out
• Checking hard drive health and replacing drives that show signs of wear
• Cleaning dust from towers and workstations to prevent overheating
• Reviewing firewall logs for unusual access attempts
• Verifying that wifi access points still cover the whole office properly
• Checking the UPS status and its real battery autonomy
• Updating switch and router firmware to close known vulnerabilities
• Reviewing user permissions and removing access for people no longer at the company

What corrective maintenance is

Corrective maintenance comes into play once something has already stopped working: a computer that won’t boot, an application that keeps crashing, a connection that has dropped. The goal is not to prevent but to fix, and the sooner it is handled, the less it affects the business.

A good corrective maintenance service does not just put out the fire; it records what happened and why, so that same fault gets added to the list of things reviewed preventively from then on.

Five examples of corrective maintenance

Real urgent-call situations we handle once the incident has already happened:

• A computer that won’t start on a billing morning and needs immediate attention
• A hard drive that fails suddenly and must be replaced and restored from backup
• A network printer that stops responding and blocks a whole department’s work
• An internet outage that leaves the whole office without email or cloud access
• A server that keeps restarting on its own and needs the cause diagnosed before it happens again

Predictive maintenance, one step further

Predictive maintenance does not wait for the scheduled check or the breakdown: it relies on continuous monitoring to spot that something is degrading before it fails, such as a drive starting to throw read errors or a server whose temperature climbs above normal.

It does not replace preventive or corrective maintenance, it complements them: it brings the warning forward so the intervention can be planned as preventive, instead of turning into an urgent corrective one.

How we combine them in one maintenance contract

At iDeo Mantenia we work with scheduled preventive reviews, monitoring that acts as the predictive layer, and corrective response capacity when something breaks outside a review, without the company having to manage three different providers.

When an incident happens outside the calendar, we do not wait for the next visit: it is handled as an independent corrective intervention, and afterwards we review whether the preventive plan needs adjusting so it does not happen again.