Here you go:
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Edit the Crontab file using: sudo crontab -e
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Put this command at the end of the file to reboot the system at 3am every day: 0 3 * * * /sbin/reboot
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Save the file and a message ‘crontab: installing new crontab’ should appear.
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Restart cron with: sudo /etc/init.d/cron restart
That’s it. When 3am next rolls around, your system will reboot and restore the memory usage to about 900MB, give or take a little.
I take it you’ve worked out how to start WD automatically after reboot?