> This is not remotely the same thing. A RAID offers no protection against logical corruption from an erroneous script [...] But S3 is already storing your data in three different data centers
That sounds like...the same argument?
A RAID array stores your data on multiple physical drives in the machine, but offers no protection against logical corruption (where you store the same bad data on every drive), destruction of the machine, or loss of access to the machine.
S3 stores your data in multiple physical data centres in the region, but offers no protection against logical corruption, downtime of the entire region, or loss of access to the cloud.
You can't count replicas as providing durability against any threat that will apply equally to all the replicas.
That sounds like...the same argument?
A RAID array stores your data on multiple physical drives in the machine, but offers no protection against logical corruption (where you store the same bad data on every drive), destruction of the machine, or loss of access to the machine.
S3 stores your data in multiple physical data centres in the region, but offers no protection against logical corruption, downtime of the entire region, or loss of access to the cloud.
You can't count replicas as providing durability against any threat that will apply equally to all the replicas.