这三个SAP product都有个各自的data migration approach
CRM
通过XIF和IDOC来进行CRM和legacy system之前的数据交互
比如可以把系统里Service order的内容通过IDOC存成一个file: Step by step to send IDoc data into external receiver via XIF adapter
或者通过一个IDOC创建新的Service Order: Create new Service Order via XIF
C4C
See one example: Import Account data into C4C system via excel download and upload
Hybris
和C4C类似，也是通过csv来import/export:
The ImpEx extension allows you to create, update, remove, and export platform items such as customer, product, or order data to and from Comma-Separated Values (CSV) data files both during run time and during SAP Hybris Commerceinitialization or update process.