Manually Backing Up a Hive to a Named File

regback filename hivetype hivename

Where:

filename: is the name of the backup file to be created.
hivetype: is either machine or users. Will fail if the hivetype isn't machine or users.
hivename: is the name of an immediate subtree of HKEY_LOCAL_MACHINE or HKEY_LOCAL_USERS. Will fail if hivename isn't a hive root.

For example:

regback c:\backuphive\system machine system

regback c:\savedir\prof users s-1-0000-0000-1234