The DHCP Server service automatically performs a backup of the DHCP database and DHCP Server registry configuration key every 60 minutes (and overwrites the previous back up). You can also perform a manual backup as outlined in the GUI solution. Backup files are stored in %SystemRoot%\system32\dhcp\backup by default, but you can change that location as described in the CLI solution. You should change this path to another drive so that a disk failure doesn’t impact both the active database and the backup files.

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