Some modules require regularly scheduled actions, such as cleaning up log files. Using cron can make these happen automatically.

starbuck@helen:~/public_html$ crontab -l
# m h  dom mon dow   command
15 * * * * /usr/bin/wget -O - -q

If your Drupal site is hosted at LS.Net and admin/logs/status doesn't show a recent "Cron maintenance tasks",  contact the webmaster and have him set up a crontab like the one above.

If you have shell access run "crontab -e" and make an entry like the one above for your domain.

If you don't have shell access, ask your web host to set up an entry.

If nothing else works, you might choose a different web host or look into poormanscron.

Note: patching "scripts" such as adds one more location to backup when updating your site.