--- title: "Yandex Confirms Irretrievable Loss of 2.84% of Yandex Cloud Client Data Following UAV Attacks on Data Centers" description: "Yandex announced the restoration of access to 97.16% of Yandex Cloud client data following UAV attacks on three data centers. The company recognized the remaining 2.84% as irretrievably lost due to equipment damage." date: 2026-11-10T18:48:58.346Z lang: en url: https://xab.info/en/posts/yandex-cloud-data-loss-after-uav-attacks tags: [yandex-cloud, data-center, uav-attacks, cloud-infrastructure, data-backup] author: "Alexander Buran, Roman V." publisher: "XAB.info" --- # Yandex Confirms Irretrievable Loss of 2.84% of Yandex Cloud Client Data Following UAV Attacks on Data Centers ![White graphic representation of the letter Ya and a heart symbol on a red background, representing Yandex](https://xab.info/media/2026/11/10/yandex-cloud-poterya-dannih-posle-atak-bpla/yandex-cloud-poterya-dannih-posle-atak-bpla-1.webp) ## Key Points - Yandex has restored access to 97.16% of Yandex Cloud client data; 2.84% was irretrievably lost due to equipment damage and lack of backups. - Clients with activated Yandex Cloud backups preserved 100% of their data. - Following UAV attacks on three data centers (Sasovo, Kaluga, Vladimir), backups are now enabled by default when creating new VMs. - The Chervonenkis, Galushkin, and Lyapunov supercomputers were reportedly unharmed. ### 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. ## Fact-Check & Sources - [«Яндекс» признался, что безвозвратно потерял меньше 3 % данных клиентов Yandex Cloud](https://3dnews.ru/1151103) - Primary source: recovery figures (97.16%/2.84%), backup policy change, attack geography (Sasovo, Kaluga, Vladimir), supercomputer status. Data center damage figures reference Interfax. - [«Яндекс» признался, что безвозвратно потерял меньше 3 % данных клиентов Yandex Cloud](https://3dnews.ru/1151103/yandeks-priznalsya-chto-bezvozvratno-poteryal-menshe-3-dannih-klientov-yandex-cloud) - Duplicate link to the same 3dnews.ru material; content matches the primary source. ## FAQ ### How much Yandex Cloud client data was recovered? According to Yandex, access has been restored to 97.16% of client data, while the remaining 2.84% is considered irretrievably lost. ### Why could some data not be recovered? The company attributes this to critical equipment damage and the affected clients' failure to use platform-side backups in Yandex Cloud. ### Which data centers were damaged in the attacks? From October 8 to 11, three data centers were damaged — in Sasovo, Ryazan Oblast, Kaluga, and Vladimir. According to Interfax, the data centers in Sasovo and Vladimir were completely shut down, and several modules were disabled in Kaluga. ### Has the backup policy changed? Yes. Backups are now enabled by default when creating new virtual machines, whereas previously they had to be activated manually. The service can be opted out of.