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Procédure d'incident & Remédiation : Corruption d'une sauvegarde Proxmox VE
1. Main Causes of Data Unavailability
In the event of a restore failure or inability to mount a Proxmox VE backup point, the causes generally fall into two categories:
- Network instability (Logical corruption): Brief network outages, packet loss, or interrupted data flows during write/replication operations, compromising the integrity of data blocks.
- Hardware failures (Physical corruption): Bad sectors on the target storage, RAID controller failures, or corruption of the host file system (NTFS/ReFS/XFS).
2. Recovery Capabilities & Proxmox VE Backup Integration
Our infrastructure incorporates strict protocols to validate and restore critical environments:
- Integrity verification: Use of native verification mechanisms (checksums) to identify and isolate corrupted blocks.
- Proxmox VE integration: Granular recovery, extraction of configuration files, and mounting of backup points through dedicated proxies to bypass damaged index files.
3. Tools & Evolution of the Recoveo Technical Stack
To handle severe corruption cases, our team uses specific in-house tools developed to overcome the limitations of standard recovery solutions:
| Tool | Version / Infrastructure | Technical Focus & Use |
| Backup Recovery | 2019 Stack | First generation. Focused on index reconstruction and restoring the structural integrity of Proxmox VE backup files. |
| Backup Extractor | 2026 Stack (Current) | Advanced version. Enables raw data extraction directly from corrupted volumes, optimizing RTO when dealing with new types of incidents. |
⚠️ Warning: Before attempting any remediation, make sure to create a bit-for-bit copy (snapshot or clone) of the affected repository to preserve the original source data.
Two Main Backup Recovery Methods:
In-Lab or Remote
In-Lab Database Recovery
Most of our data recovery operations are still carried out in our laboratories. The main advantage is that physical servers provide us with more recovery options than uploaded files alone. In-lab recovery is essential in cases involving data deletion, where data has actually been erased.
Remote Database Recovery
Remote recovery is becoming increasingly common in our operations. The main advantage is that it does not require the physical transportation of servers or drives, reducing logistics costs and eliminating the risk of damage during transit. There are also no customs-related issues to consider. Your server can remain online if services are still running on it.
Proxmox VE Backup Recovery Process
Extracting the maximum amount of data for every client: that is our mission. Each database presents a unique, tailor-made challenge, where we consistently push beyond the limits of standard software. Powered by high-performance systems, we process your data in record time.
Evaluation
Definition of the technical scope and recovery priorities during a technical phone consultation.
The first step toward effective data recovery.
Diagnosis
Your storage media are handled by our specialists. We systematically create a clone to preserve the original evidence in the event of an investigation.
Recovery
Extraction of priority data, integrity testing, and creation of a list of recovered files. Then, secure restoration and resumption of business operations.
Success story
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Data Recovery from a Corrupted and Unusable Proxmox VE Backup in Bordeaux, France
A Proxmox VE Backup That Could No Longer Be Restored
An SME based in Bordeaux, France, contacted us through our website www.recoveo.com after a Proxmox VE backup became unusable and could no longer be restored. The client was unable to restore the backup, and the initial assumption was that the backup file had become corrupted.
Transfer of the Corrupted Backup via FTP
From the initial contact, our team of specialists carried out a complete assessment of the situation with the client. During this stage, the Bordeaux-based company informed us that the affected backup was a Proxmox VE backup in .vma.zst format, with a total size of approximately 2.2 TB. To facilitate the transfer, our team created a unique FTP link allowing the client to send us the entire backup. The client also provided us with the name of the affected file: vzdump-qemu-101-2026_04_15-09_58_23.vma.zst
Error Message When Opening the Backup
After successfully receiving the Proxmox VE backup, one of our RECOVEO engineers first attempted to open the backup using a standard method, without success. The software displayed an error message confirming that the backup could no longer be accessed using conventional restoration methods.
Technical Analysis and Data Reconstruction
The analysis was assigned to our R&D engineering team to determine the exact nature of the issue. Initial checks revealed that part of the data blocks was unreadable. More specifically, approximately 14% of the analyzed segments contained incomplete structures & data blocks. Based on this mapping, our R&D team first succeeded in isolating the readable blocks. A second discussion was then held with the client to share the initial findings and identify ways to improve the overall data recovery success rate. Following this discussion, the client provided us with two additional data sources: an older backup and a production virtual machine, which was also corrupted, to supplement our analysis. After cross-analyzing the different available data sources and using specialized equipment, our R&D engineering team confirmed the following results to the client:
Result: 92% of the priority files were recovered and validated
Initial volume analyzed: 2.2 TB
Recoverable volume restored: 1.7 TB, representing an overall recovery rate of 77% of the initial volume
Delivery and Validation
To ensure reliable validation, the recovered database files were mounted on a secure SQL Server environment and made available to the client for quick and efficient review. This allowed the Bordeaux-based client to review the recovered files, verify their contents, and validate the priority data before final delivery. Following final validation by the client, the recovered data was transferred via FTP for fast and secure delivery. The entire data recovery process took only 48 hours, allowing the client to quickly resume business operations.
Why Choose Recoveo to Recover Your Corrupted Proxmox VE Data?
Experience
With experience handling more than 250 ransomware cases, we have adapted our tools and processes to maximize the chances of successful data recovery.
Proxmox VE Backup Specialist
Since 2019, we have been developing our own tools specifically for data recovery from Proxmox VE backups.
Fast
Our software has been rewritten to process Proxmox VE files even faster.
Our emergency response team is available to handle your request as quickly as possible.
Free Assessment
We offer a free analysis of a Proxmox VE file of your choice to demonstrate our expertise. Simply send us the file.
How Quickly Do You Need Your Data?
We offer flexible service options to meet your specific needs and budget requirements.
24/7
- On-call processing
24/7/365
- Dedicated team
- Average turnaround time: 1 to 3 business days
Urgent
- Priority processing during business hours
- 1 dedicated engineer
- Average turnaround time: 3–7 business days
Standard
- Processing during business hours
- 1 shared engineer
- Average turnaround time: 7–14 business days
FAQ
Everything You Need to Know About Proxmox VE Data Recovery Services.
La récupération de données d’une base de donnée est le processus de restauration des données perdues ou corrompues à partir d’une base de donnée. Cela peut être fait à l’aide de nos services spécialisés de récupération de données.
Les causes courantes de perte de données de machines virtuelles incluent la suppression accidentelle, les pannes matérielles, la corruption de logiciels, les attaques de logiciels malveillants ou de virus , les pannes ou surtensions de courant et les erreurs des utilisateurs.
Oui, en fonction de l’étendue des dommages, les données de la base de donnée peuvent être récupérées même si la base de donnée est corrompue ou endommagée avec l’aide de prestataires de services professionnels de récupération de données.
