[CentOS] BackupPC: two newbie questions

I'm running BackupPC under Centos-5.2.

1. Will BackupPC backup files in NFS-mounted directories?
If so, is there any simple way of preventing this?

2. I have seen it suggested that it is not a good idea
to backup onto a partition on the same drive
as the BackupPC server?
Is that true?
If so, is a partition on a separate drive on the same machine also bad?

Ps Apologies if this has been posted before;
I have had some problems communicating with mailing lists.

-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland