The DHCP Database Files section in the DHCP online Help states that the default DHCP BackupInterval is 15 minutes.
The correct default is 60 minutes:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DhcpServer\Parameters
BackupInterval is a REG_DWORD value with a range from 1 to 71582 minutes.
A related entry is BackupDatabasePath, a REG_EXPAND_SZ value, that specifies the folder where the backup copy of the DHCP client database resides.
NOTE: The backup can be on a different local drive, to facilitate recovery.
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