Let's assume a 1PB storage full of VMs images with each brick over ZFS, replica 3, sharding enabled
How do you backup/restore that amount of data?
Backing up daily is impossible, you'll never finish the backup that the following one is starting (in other words, you need more than 24 hours)
Restoring is even worse. You need more than 24 hours with the whole cluster down
You can't rely on ZFS snapshot due to sharding (the snapshot took from one node is useless without all other node related at the same shard) and you still have the same restore speed
How do you backup this?
Even georep isn't enough, if you have to restore the whole storage in case of disaster
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