Sure you could have multiple level-0 backups to increase the odds of whatever blob you have corrupted can be found in other copies, but that's inefficient. It'

Sure you could have multiple level-0 backups to increase the odds of whatever blob you have corrupted can be found in other copies, but that's inefficient. It's much more efficient to deduplicate, then add redundancy. Like say storing said blobs on a RAIDz3. Or use backblaze's approach and split the blob into 17 pieces, add 3 pieces of redundancy, and distribute the chunks across 20 racks. If you are serious of course you'd have an onsite backup, deduplicated, with added redundancy AND the same offsite.