Always create backup copy

Supported on: At least Windows Server 2008 R2 or Windows 7

Registry

HKCU software\policies\microsoft\office\16.0\word\options

Value name: backupduringsave

Enabled: backupduringsave = 1

Disabled: backupduringsave = 0

Checks/unchecks the corresponding UI option found under File tab | Options | Advanced | Save.