I'm talking more about the checksums of files over time, and error correction should they deviate. I recently read about facebooks cold storage and it got me t

I'm talking more about the checksums of files over time, and error correction should they deviate. I recently read about facebooks cold storage and it got me thinking about it (https://code.facebook.com/posts/1433093613662262/-under-the-hood-facebook-s-cold-storage-system-/ https://code.facebook.com/posts/1433093613662262/-under-the-...) though for them they just want one copy total.