Yandex said 2.84% of customer data in Yandex Cloud cannot be recovered after attacks damaged its data centers, prompting the Russian company to enable backups by default for new virtual machines.
The company said Nov. 10 that engineers had restored access to 97.16% of customer data. It did not say how much data those percentages represent, how many customers were affected or how it calculated the figures.
Yandex said damaged equipment and the absence of some customers’ backups on its platform prevented recovery of the remaining data. Customers who had used its backup tools retained all their data, the company said.
Previously, customers had to enable backups themselves. Yandex said the service is now on by default when customers create new virtual machines, though they can opt out. The service remains available under its previous terms.
The change follows October attacks on the company’s data centers. Yandex said a drone strike overnight Oct. 7-8 forced its Sasovo facility to shut down after extensive damage. An attack on Oct. 9 disabled some infrastructure at its Kaluga facility, the company said. Yandex did not identify who carried out the attacks.
The disruption reached other services. EconoTimes reported that ride bookings and deliveries had resumed by Oct. 19, while restrictions on the company’s cloud platform continued. At the time, Yandex gave no deadline for full restoration.
Yandex also said it is distributing computing capacity among separate sites in multiple Russian regions and expects to add more locations. It gave no target number or timetable for the expansion.
In its Oct. 29 third-quarter release, Yandex withdrew its 2026 revenue and adjusted EBITDA forecasts, citing the October attacks and other external factors that made results for the rest of the year difficult to assess. The attacks occurred after the quarter ended and did not affect those results, the company said. Yandex said it would consider issuing guidance again starting next quarter.
