Veeam Backup Data Recovery
Backup systems are designed to protect your data. But when those backups fail, recovery depends on more than the tools that created them.
There are many platforms designed to manage and protect virtual environments, and while they offer similar capabilities, each comes with its own complexities. When something goes wrong, whether due to system failure, corruption, or a ransomware attack, even well-designed backup systems can fail in a critical hour of need. If your Veeam backups are damaged or won’t restore your data, our Veeam data recovery experts can help.
What is Veeam?
Veeam is a widely used backup and disaster recovery platform designed to protect virtual machines, file systems, and critical business data. Organizations rely on it to create full and incremental backups that can be restored quickly in the event of a system failure, cyberattack, or any other form of data loss. However, when those backup files themselves become corrupted or partially destroyed, standard restore processes can fail, leaving businesses without a clear path to recovery. This is particularly troublesome in situations where an organization has been affected by ransomware, and time is often of the essence.
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Case Study: Rebuilding Corrupted Veeam Backups After Ransomware
The Problem: Following a ransomware attack, a company’s TrueNAS X20-HA system — used for offsite Veeam backups — appeared completely empty. The attacker had deleted data from an 80 TB ZFS filesystem, one of the most complex and resilient storage systems in use.
After an intensive recovery effort, our engineers were able to restore dozens of virtual machine backups. However, there was a critical issue: the primary backup files (VBKs) contained small amounts of unrecoverable data. Even minimal corruption — often less than 0.3% — was enough to cause Veeam’s restore process to fail.
Initial recovery attempts confirmed the challenge. Veeam detected inconsistencies in the backup data and halted restoration, flagging checksum and integrity errors. Even after the client worked with Veeam support to obtain modified tools that could bypass some of these checks, results were inconsistent. Smaller systems could be restored with effort, but larger, more critical datasets failed entirely due to corrupted backup metadata.
At one point, Veeam support confirmed there were no tools available to repair partially corrupted backup files — effectively leaving the client without a viable recovery path.
Our Approach: Rather than accepting those limitations, our engineers went deeper.
We analyzed the internal structure of the VBK backup files through reverse engineering, identifying how metadata, checksums, and data blocks were organized. When standard recovery methods failed, we began developing custom techniques to work around the corruption.
This included:
- Recalculating and correcting checksum values to bypass validation failures
- Identifying and reconstructing damaged metadata structures
- Replacing unrecoverable regions with controlled, structured data instead of empty placeholders
- Iteratively testing and refining recovery attempts based on system behavior
When even these methods hit limits, we used insights gained throughout the process to develop a custom VBK recovery tool within our internal platform — allowing us to reconstruct virtual disks directly from partially corrupted backups.
The Result: We successfully rebuilt critical virtual machine data, recovering approximately 99.5% of filesystem structure and 99.9% of files — totaling over 1.1 TB of usable data.
What began as a complete backup loss — with no supported path to recovery — became a successful restoration through custom engineering and persistence. This case demonstrates a core truth about ransomware recovery: when standard tools stop, Gillware doesn’t.
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