A green tick on a backup job is one of the most misleading signals in IT, because it confirms only that data was successfully written somewhere — not that it can be successfully restored, in a usable state, within the time you'd need it. Industry research on backup and recovery has repeatedly found a meaningful share of restore attempts fail to meet the desired outcome, and separate research has found a substantial proportion of businesses that never test their backups discover critical failures only when attempting recovery during an actual incident — which is the single worst possible moment to discover it.
Restores fail for reasons that have nothing to do with whether the backup itself was successful: expired credentials for the recovery environment, missing drivers, configuration drift between the backed-up system and its replacement hardware, or a schema mismatch after months of incremental changes the backup never accounted for.
The test that matters isn't a checksum or a job-completion log — it's an actual, periodic restore drill: taking a real backup and genuinely restoring it, ideally into an isolated environment, and measuring how long it took and whether the result was actually usable. If that hasn't happened recently, the honest status of your disaster recovery capability is "unverified," not "in place."
The frequency that matters depends on how much the environment changes — a system that's static month to month needs less frequent testing than one under active development, where schema and configuration changes accumulate between drills and can silently invalidate a restore process that worked perfectly six months ago.
None of this needs to be disruptive. A well-designed restore test runs against an isolated copy of production, not production itself, and the organisations that build this into a routine cadence are the ones who find out their backup strategy has a gap on a Tuesday afternoon, not during an actual outage.
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