Security advisory · 6 min read

Security advisory: an untested backup is not a backup

Every business we are called into during a ransomware incident had backups. The ones that recovered quickly had tested backups, at least one copy the attacker could not reach, and a documented recovery order. The distinction decides whether an incident lasts a day or a month.

Brisbane, QLD ·

Immutability is the control that stops the worst case

Modern ransomware operators look for the backup system first. If your backups sit on a share reachable with domain administrator credentials, they are part of the attack surface, not the recovery plan.

At least one copy should be immutable or genuinely offline, with separate credentials that are not used anywhere in daily administration.

Measure your real recovery time

Most organisations quote a recovery time objective they have never tested. Restore one meaningful system from backup, time it end to end including data validation, and write the number down. That is your actual objective.

We run restore rehearsals quarterly for managed clients and report the measured result, because a backup only counts once it has been restored.

Recovery order beats recovery speed

Restoring the file server first when your identity provider and line-of-business database are still down wastes the window in which stakeholders are patient. Document the dependency order before you need it: identity, network, core application, data, then endpoints.

Notification obligations run in parallel

Australian organisations covered by the Notifiable Data Breaches scheme must assess whether an eligible data breach has occurred and notify affected individuals and the OAIC where serious harm is likely. That assessment starts during the incident, not after recovery, so name the responsible person in advance.

In short

Immutable or offline copies, a measured recovery time, a documented recovery order and a named person for breach assessment are the four things that separate a bad week from a business-ending event.

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