United Telecom has release plan for their digital transformation it includes both legacy CRM and their new communication cloud, both of which will be active until the digital transformation is complete. Customer data from the legacy CRM will be migrated into communication cloud as part of first phase of the digital transformation project. There are business critical operations that will remains active in legacy CRM after the first phase of project. Which strategy should a consultant recommended to keep the customer data to sync between the legacy CRM and communication cloud?