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Tarsnap de-dup - one machine or all?

Does tarsnap's de-dup work on one machine at a time or across all
machines in an account?

The reason I ask is because I've moved a largish mail archive from one
machine to another and am unsure whether the backup on the new machine
will reuse the blocks from the old one, or whether I'll end up using
double the space.

The number of people predicting the demise of Moore's Law doubles
every 18 months.