Take a full backup of the database (MaxDB) on the source system.
Set up the target server on Windows 2008
Install SAP Content Server 6.50 on the target system.
Restore the backup taken on the source system to the target system.
Reconfigure the content repositories in Tx OAC0 and check Tx CSADMIN
Read these SAP note to know about MaxDB system copy.
129352 - Homogeneous system copy with SAP MaxDB
1014782 - FAQ: SAP MaxDB system copy
Cheers
RB