A workstation slow for weeks, a backup that has not run in six months, an expired antivirus licence: most serious failures are preceded by signs nobody had time to handle.
What you can monitor yourself
Check that system updates are applied. Make sure automatic backup is running. Physically clean fans once a year: dust is the main cause of overheating.
When it goes beyond that
Several workstations to manage, regular follow-up needed, repeated failures, mixed Windows and Mac setup.
Real case
Small business in Pont-Saint-Esprit with three Windows PCs and one Mac. Monthly contract, remote checks every month, on-site visit when needed. In six months, zero unplanned failures compared with two full stops the previous year.
One contact who knows your setup and steps in before it breaks.