I'am no specialist regarding Free NAS, but I guess it might be possible with the following setup:
1) execute the command "shutdown -h now" every day automatically via cron at e.g. 6 pm in the evening.
2) Run your server behind a timer (Zeitschaltuhr

) that powers the server off at 6:30 pm and powers it on at e.g. 7 AM again. Your motherborad must be configured to boot when the power is switched on. For example some mini-ITX boards that I know support this.
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