CmdID

CmdID / Commands / reg

reg save

Saves a copy of specified subkeys, entries, and values of the registry in a specified file. Windows commands reference

On Windows

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Windows

from the Windows commands reference, CC BY 4.0
reg save <keyname> <filename> [/y]
reg save HKLM\Software\MyCo\MyApp AppBkUp.hiv
<keyname>Specifies the full path of the subkey. To specify a remote computer, include the computer name (in the format \<computername>\) as part of the keyname. Omitting \<computername>\ causes the operation to default to the local computer. The keyname must include a valid root key. Valid root keys for the local computer are: HKLM, HKCU, HKCR, HKU, and HKCC. If a remote computer is specified, valid root keys are: HKLM and HKU. If the registry key name contains a space, enclose the key name in quotes.
<filename>Specifies the name and path of the created file. If no path is specified, the current path is used.
/yOverwrites an existing file with the name filename without prompting for confirmation.
/?Displays help at the command prompt.