[teraflop]

Presumably Google also keeps backups, though, right?

[dietr1ch]

And mirrors to at least one extra datacenter as they can lose bandwidth with a fiber getting cut, become unreachable due to networking snafu, or even burn down entirely.

[dilyevsky]

Yes they also store to tape

[AuthorizedCust]

That means 2X at a minimum. Then RAID overhead. Possibly other hot or warm copies ready to take over instantly.

[dilyevsky]

And tape costs same as ssd/spindles in your calculations?