"A Backblaze Vault is comprised of 20 Storage Pods, with the data evenly spread across all 20 pods. ... Drives in the same drive position in each of the 20 Stor

"A Backblaze Vault is comprised of 20 Storage Pods, with the data evenly spread across all 20 pods. ... Drives in the same drive position in each of the 20 Storage Pods are grouped together into a storage unit we call a “tome”. ... Every file uploaded to a Vault is broken into pieces before being stored. Each of those pieces is called a “shard”. ... Each file is stored as 20 shards: 17 data shards and 3 parity shards. Because those shards are distributed across 20 storage pods in 20 cabinets, the Vault is resilient to the failure of a storage pod, or even a power loss to an entire cabinet." From https://www.backblaze.com/blog/vault-cloud-storage-architecture/ https://www.backblaze.com/blog/vault-cloud-storage-architect..., which is well worth taking a few minutes to read. Their approach to data resiliency is pretty neat and full of the kind of common-sense reasoning that warms the very bottoms of my ol' sysadmin's heart ("use simple parts" and "build the tools you need to run your infrastructure", among others).