those steps talks about SEPM DB on a different server.
take the recovery file backup from the old server and turn it of
bring up the new server with the same name and IP address of the old SEPM server
in the MSCW, choose Install an additional management server to an existing Site.
point it to the existing database with the same SQL or windows credentials
and ensure to use the latest recovery file
follow the next steps carefully
you should be all set once the database initialization and the remaining parts of the wizard is done.
all your clients will automatically point to this new SEEM server in an assumption that its still the old SEEM.