Backup Monitoring: How Do You Know Your Backups Are Working?

"The backup ran last night" and "the backup actually protects us" are two different claims, and the gap between them is exactly what backup monitoring exists to close. A completed backup job is not the same thing as a working one.

How This Is Different From Backup Testing

Testing is a periodic, deliberate exercise - actually restoring data to confirm it works. Monitoring is the ongoing, automated layer that watches every backup job, every day, for signs something's wrong, without waiting for a scheduled test to find out. See our guide on how to test your business backup for the testing side specifically - the two are complementary, not interchangeable.

What Monitoring Actually Catches

• Failed or incomplete jobs - the most obvious case, but easy to miss without active alerting rather than a manual check
• Silent scope gaps - a newly added server or a new folder structure that was never added to the backup job's coverage
• Shrinking backup size - an unexpected drop in backup size can indicate data that's no longer being captured, not just data that's been deleted
• Missed schedule windows - a job that used to run overnight now failing to complete within its window, often an early sign of a growing data volume or performance issue
• Storage capacity issues - a backup destination silently approaching capacity, which can cause jobs to fail once it's full

Why "It Says Successful" Isn't Enough

A backup job can report success while backing up a corrupted database, an empty folder where data used to be, or a subset of what it's actually meant to cover. The completion status confirms the job ran without an error - it says nothing about whether the resulting backup would actually restore the data you need.

What Proper Monitoring Looks Like

• Daily automated checks across every backup job, not a periodic manual glance
• Alerting that reaches a real person quickly when a job fails or behaves unexpectedly, not just a dashboard nobody checks
• Tracking backup size and duration trends over time, to catch gradual drift before it becomes a real gap
• Coverage confirmation whenever new systems or data sources are added to the environment

How Monitoring and Testing Work Together

Monitoring catches day-to-day operational failures quickly. Testing catches the deeper question monitoring alone can't answer: even when a backup completes successfully and looks healthy, does the resulting data actually restore cleanly? A mature backup strategy runs both, on a regular schedule, rather than relying on either alone.

What to Ask Your Current Provider

• Are our backup jobs monitored daily with active alerting, or only checked periodically?
• What happens when a job fails - how quickly is it noticed, and by whom?
• When was the last time a full restore was actually tested, not just confirmed as "completed"?

Frequently Asked Questions

For related reading, see our guides to how to test your business backup and immutable backups explained.