Backup to tape drive without local pbs-datastore

We have a pbs (let's call ist pbs1) and want to add a tape drive backup. Unfortunately the location of the pbs1 is not really good reachable to change the tapes. Therefore we'd like to build an additional small pbs-"server" with a tape drive and NO local datastore (pbs2). Best would be to "mount" the datastore from pbs1 to pbs2 and make the tape backup from this mount on pbs2.
Does this work or are there other existing solutions for that?

Thank you and best,
Johannes