Samba authentication when AD is down?

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http://serverfault.com – I have succesfully added my Freebsd 9 to a Windows server 2008 R2 AD Domain. Using samba 3.6. The problem is that i want to be able to connect to the shares when the AD server is down. Because the backup of the AD server is placed onto the BSD 9 system, so when booting the windows server CD repair i cannot connect to the share because of session setup failed: NT_STATUS_NO_LOGON_SERVERS, How to make samba use AD and if needed fail over to local passwords only? EDIT: The setup is the following. machine1 Windows Server 2008 R2. machine2 Freebsd amd64 9.0. machine1 is Active Direcotory Dom (HowTos)