directories to exclude for backups

[Benjamin P. Keating]

My Plan is to make a gzipped tarball of the entire machine, excluding 
directories that are not necessary. If however, there is a more sound 
solution then tarballing a machine for a backup, Im all ears. I know 
rsync is a possibility, but i'd like to have just a solid, non-active 
archive copy of machines.

EXCLUDE DIRECTORIES
----------------------------------------------
/proc
/dev
/tmp
/usr/ports/
/var/tmp/

What else would be safe to exclude?

Thanks,
-Ben

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