Reinstall UCS but keep domain data

Hi there,
due to various reasons I need to reinstall UCS from scratch.
Re-adding all devices, DNS, DHCP etc is not the problem but how to keep the existing domain data, i.e. I need a previously joined windows server to authenticate against the domain after update.
How to do this? Do i need the ldap to be restored or is this the samba configuration? If samba which parts are needed from the old install?

Thanks for any input!
Christian

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