A couple of weeks ago I noticed the internet was down when I woke up. When I checked the Unifi DreamMachine it turns out it was completely crashed. When I tried to restart the DreamMachine it hanged during the boot process.
The only option was completely re-installing the DreamMachine and restore the backup. But after re-installing the firmware all backups stored local were overwritten and not available.
I needed a PowerShell script to copy the latest created backup to a local drive or network share. Check the blog how to enable SSH and AutoBackup on the UDM(-Pro)/DreamMachine and how to copy the latest created backup file to a save location.