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What a good backup system looks like (not just a file copy)
Backup is not one copy on the same server. We explain what makes a reliable backup: a schedule, versions, a separate location and testing.
"We have a backup" is a sentence that often means just one old copy of data sitting on the same physical server as the original — meaning it would perish completely along with the original in case of a disk failure, a data-centre fire, or any problem hitting the whole server. A real, reliable backup is a thought-through system with clear rules, not an accidental, occasional copy.
What concretely makes a reliable backup
A schedule — the backup is made automatically and regularly (daily or even more often for critical data), never manually "when someone remembers", because human memory is an unreliable point guaranteed to fail one day exactly when the backup is needed most.
Multiple saved versions over time — the ability to return to the state from a week or a month ago is key, because if an error or data corruption is discovered later (not immediately), the latest copy may already contain the same error.
A physically separate location — the backup must be on a physically different server, preferably in a different data centre or even a different region, not on another disk of the same physical server sharing the same risk of fire, flood or theft.
A periodic restore test — a backup that has never actually been tested by restoring data may not work at all when truly needed, and that is discovered at exactly the worst possible moment if it wasn't checked beforehand.
Why this is often underestimated
Backup is an invisible investment — while it works correctly, nobody notices or appreciates it, until a catastrophe happens and the backup either saves the company or fails it exactly when needed most. That is why we treat a serious backup system with all the listed elements as a standard, mandatory part of every project we run, not an optional add-on.
Nikola Cerić
Founder & CEO, Manage IT
More than 10 years of software development experience — in his own company and in major IT companies across the Balkans.