已设置Mac OSX每日0点自动开机，如何实现意外关机后自动启动？

Alright, since you're repurposing your Mac desktop as a server and need it to automatically power back up no matter what—whether it's a power outage, system crash, or unexpected shutdown—I’ve got you covered with these actionable steps:

This is the hardware-level setting that ensures your Mac boots back up automatically when power is restored after a blackout. Here's how to set it:

• Restart your Mac and hold Command + R immediately to enter Recovery Mode.
• From the top menu bar, go to Utilities > Terminal.
• Run this command to enable the feature:

  systemsetup -setrestartpowerfailure on
  

• Verify it’s enabled with:

  systemsetup -getrestartpowerfailure
  

  You should see Restart After Power Failure: On as the output.

You already set a 0AM auto-start, but let’s make sure this setting is robust and covers scenarios where the system might miss the schedule:

• For macOS Ventura or later: Open System Settings > General > Startup Disk, click the Options button, then check the box for "Start up automatically after a power failure" (this ties into the hardware setting above, but it’s good to confirm here too).
• For older macOS versions: Open System Preferences > Energy Saver, click Schedule, ensure "Start up or wake" is checked, set it to "Every day" at 12:00 AM, and save the changes.
• Double-check via Terminal with:

  systemsetup -getstartupdatetime
  

  This should show your scheduled 0AM startup time.

To make sure your Mac reboots automatically if it locks up or crashes:

• Open Terminal (no need for Recovery Mode this time) and run:

  systemsetup -setrestartfreeze on
  

• Verify with:

  systemsetup -getrestartfreeze
  

  The output should read Restart On Freeze: On.

• Update Firmware: Make sure your Mac’s firmware is up to date—go to System Settings > General > Software Update to check. Outdated firmware can cause issues with auto-power-on features.
• Use a UPS: Invest in an Uninterruptible Power Supply (UPS) for short power outages. It’ll keep your Mac running long enough to shut down gracefully, then trigger the auto-restart once power is back.
• Monitor System Health: Set up a simple monitoring script (using launchd or cron) to send you a daily ping/email. If you don’t get it, you’ll know to check if the server failed to boot for some reason.

内容的提问来源于stack exchange，提问作者jean377