Science & Tech · Cybersecurity · 3 hrs ago
Yandex says nearly 3% of cloud customer data cannot be restored
Yandex says 2.84% of customer data in Yandex Cloud is permanently lost after Ukrainian drone attacks damaged its data centers in Russia.
The attacks hit three of the company’s six data centers between October 8 and 11, disrupting a range of services that rely on Yandex infrastructure.
Engineers restored access to about 97% of the affected data, but the rest cannot be recovered because equipment was badly damaged and some customers had no backups.
One account estimates the lost data could include roughly 100,000 terabytes and tens of millions of files.
Customers who used Yandex’s cloud backup tools lost no data, the company said.
The loss matters because government agencies and businesses also use Yandex infrastructure, and outages affected services such as email, banking and online maps.
Yandex has made automatic backups the default for new cloud servers and says it is working to spread computing workloads across more facilities in Russia.
Yandex said it cannot restore 2.84% of customer data stored in Yandex Cloud after Ukrainian drone attacks damaged its data centers.
The company said engineers restored access to 97.16% of the affected data.
Yandex attributed the unrecoverable data to critical equipment damage and customers not having backups on the platform.
The lost data could amount to roughly 100,000 terabytes and tens of millions of files, according to a report on Yandex Cloud’s 2025 results.
Customers who used Yandex’s cloud backup tools lost no data, the company said.
- Who
- Yandex, the Russian technology company.
- What
- It said 2.84% of customer data in Yandex Cloud cannot be restored after drone attacks.
- When
- Yandex announced the loss on Nov. 10, 2026; the attacks took place between Oct. 8 and Oct. 11.
- Where
- Yandex data centers in Sasovo in the Ryazan region, Kaluga, and Vladimir were attacked.
- Why
- Yandex said critical equipment was damaged and some customers had no backups on the platform.
This story does not have two clearly opposing sides.
Ukrainian drones attacked multiple Yandex data centers.
Yandex said 2.84% of customer data could not be restored.
- Unrecoverable data
- 2.84% of customer data
- Restored data
- 97.16% of customer data
- Estimated volume lost
- Roughly 100,000 terabytes
- Attacked locations
- Sasovo in the Ryazan region, Kaluga, and Vladimir
3 sources
What people are saying
Engineers managed to restore access to 97.16% of customer data in Yandex Cloud after the attacks on the data centers.
critical damage to equipment