[plug] Setting up NFS for backups.

[Craig Ringer]

> the nohide option did the trick, but for future reference, how can I
> determine whether the /var directory is on the same filesystem?

running just "mount" will tell you what filesystems are mounted, and where.

Rather than using "nohide", which can have some issues, consider having 
your nfs client machine mount the servers' root directory, then 
separately mounting the server's var and so on. For example

mkdir /mnt/mail
mount -t nfs mail:/ 	/mnt/mail
mount -t nfs mail:/var 	/mnt/mail/var
mount -t nfs mail:/usr	/mnt/mail/usr

and so on.