Backup only one node of a Domino Cluster with archival logging

I will be implementing Tivoli Storage Manager (TSM) for Mail Protection on a Domino mail server that is a mater node in a Domino Cluster. Only the master server will run TSM for Domino backup (I have purchased only 1 backup license for TSM for Domino Protection). 1. Does transaction logs in archival required on both master & slave nodes?

  1. If yes, is it ok if I just backup the master Domino server?

  2. After Domino backup, filled transaction logs are stored in TSM, how does it accomplished with the slave domino server? Any impact?