Their systems are fault tolerant... I found more information on their storage architecture here: https://www.backblaze.com/blog/vault-cloud-storage-architecture

Their systems are fault tolerant... I found more information on their storage architecture here: https://www.backblaze.com/blog/vault-cloud-storage-architecture/ https://www.backblaze.com/blog/vault-cloud-storage-architect... [edited to sound less snarky]