Is there a doc somewhere on how to backup my GW servers (7.0.1) with BE 9.1 and 9.2.

Do I just need to run tsafsgw ie, not tsafs ?
Do I modify BE in any way ?
Do I need to purchase open file agents for my servers rather than the remote agent ?
Do I need to switch on the back up open files option in BE. I see open file errors in the log screen on BE when this all works.

Thanks for any assistance and anwers.