duplicate files on different machines, both backed up to the same account

[David Prager Branner <brannerchinese@gmail.com>]

I'm new to Tarsnap as of last night and am very pleased with it. I have this question:

I have some duplicate files on different machines, both backed up to the same Tarsnap account. It appears to me that in this situation, the usual economizing of space and archiving time — as when identical content is placed in the different archives on the *same* machine — is not taking place. Is that correct? Or is there something I can do to effect a savings here?

Many thanks!