[CentOS] BackupPC: 2 newbie questions

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 machine
as the BackupPC server?
Is that true?
If so, is a partition on a separate drive on the same machine also bad?

Ps I tried asking on the BackupPC mailing list/newsgroup
but seem to have failed to communicate in some way.