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In a Replacement project the existing system contains large amounts of historical information. Much of this information is not in active use but must be available for reference.


Only migrate information that is actively used. Once the new system can handle ongoing business the existing system is made into a read only system for future reference.


  • Less data needs to be migrated


  • Historical reporting will be more difficult unless a data warehouse is used to combine data from both old and new system.
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