The file system doesn't need it. It was designed to work for long periods.
  About the only thing that may be needed is that directories that get used
a lot, e.g. /var/spool/mqueue, etc. may need to be deleted and rebuilt to
make them smaller, but that can be done with a shell script.

]      Out and about in Ottawa.    hmmm... beer.                |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another NetBSD/notebook using, kernel hacking, security guy");  [