Single Instance Storage after the fact

Hi everyone,

I tried to find info about this online, but I couldn't find anything talking specifically about what I am trying to accomplish.

I am sending and receiving the same attachments pretty often and as a result my email accounts are growing much more rapidly than I would like.

*My goal* is to set up a second instance of Dovecot with SIS enabled and transfer everything over to this new Dovecot setup.

I was thinking of simply running a dsync backup from the old instance and then a dsync backup -R on the new instance with SIS.

Would this effectively create a new set of mailboxes without attachments (and a new folder full of attachments)?

If not, can someone point me to information on how to accomplish this?

Best regards,

Joe B.