Restoration Scope: Nearly 97% of Data Recovered
Yandex has published preliminary results on the restoration of the Yandex Cloud infrastructure following a series of unmanned aerial vehicle attacks. According to the company, access to 97.16% of client data has already been restored. The statement was made on Tuesday and reflects the current status of engineers working with damaged nodes. For clients whose data was stored with Yandex Cloud backup tools activated, the company reports 100% data preservation with zero losses recorded in this group.
Why 2.84% of Data Was Irretrievably Lost
The remaining 2.84% of client data is impossible to recover, according to Yandex's estimates. The company attributes this to critical equipment damage and the absence of platform backups by the respective clients. Thus, the irretrievable loss affected only users who did not utilize Yandex Cloud's built-in backup mechanisms. This is the key conclusion drawn by the company from the incident: having cloud-side backups proved to be a decisive factor in data preservation during physical damage to data centers.
Changes to Backup Policy
In response to the incidents, Yandex Cloud has changed its approach to backup management. While backup activation was previously manual for clients, backups are now enabled by default when creating new virtual machines. The service is provided under the same terms and can be opted out of. The company emphasizes that automatic backup activation remains a fundamental way to mitigate risks in unforeseen circumstances, including physical infrastructure damage.
Attack Geography and Data Center Status
From October 8 to 11, three Yandex data centers were damaged as a result of UAV attacks: in Sasovo, Ryazan Oblast, in Kaluga, and in Vladimir. According to Interfax, data center operations in Sasovo and Vladimir were completely halted, while several modules at the Kaluga data center were disabled. The incidents caused disruptions not only to Yandex's own services but also to other Runet resources, highlighting the significance of the affected nodes for the country's overall cloud ecosystem.
Resource Distribution and Supercomputer Status
Yandex engineers continue to distribute Yandex Cloud computing resources across new independent locations in various Russian regions, and the company states that the number of such locations will continue to grow. This effort aims to increase fault tolerance and reduce dependence on individual physical sites. Yandex previously reported that its Chervonenkis, Galushkin, and Lyapunov supercomputers were unaffected by the drone attacks, keeping a portion of its high-performance computing power operational.
