find in ISC 2.02

[fritz zaucker]

I use find to backup my system (together with cpio or afio).
I have a couple of mounted file systems, which I don't want to
backup. Therefore I used the -local switch to find.
This works fine. Unfortunately there is one very huge file system
mounted (/usr/spool/news). Because of that, find spents a very long 
time in looking through this directory tree.
Is there a way to prevent that (except unmounting it)?

Thanks
Fritz