get periodic to not scan a partition

[B. Cook]

hello all,

I have a machine doing backups with backuppc (excellent program btw)  
and I have them being stored in /exports

/dev/ad4s1h     57G     31G     21G    60%    /exports

/dev/ad4s1h on /exports (ufs, local, noatime, soft-updates)

it is now almost 6:20 am and periodic has been running since 3:01..  
and it will complete in another 4 hours..

root     92866  0.6  0.1  3064  1488  ??  D     3:01AM   1:00.93 find / 
exports -xdev -type f ( -perm -u+x -or -perm -g+x -or -perm -o+x ) ( - 
perm -u+s -or -perm -g+s ) -print0

is there something I can do to get periodic to not look in /exports?

I have the BackupPC 'backup folders' and symlinks to /usr/src /usr/obj  
and /usr/ports.

Thanks in advance