Hello Deepak, thank you for your reply. To answer your questions:
My client will stop using SAP software for their ERP system. As of April 2015, they will use Agresso ERP. In the coming year, there is going to be a big migration project to that Agresso software. After the migration is completed, the SAP ERP system is to be shut down but they want to keep the data for audit/legal requirements for a considerable length of time ( at least 6, maybe more years). The data might need to be reviewed in the future from auditors or legal people. The offline backup solution and/or keep the system offline/online in a hardware carry certain risks that my client's management are not comfortable with.
So, I was looking for ILM. From what I have read so far, one ILM component is installed in the Legacy ERP system to facilitate with the arciving of data. Not sure where the Retention Warehouse is running though. My worry is that I would need a new ERP system to have the RW installed there? Or have I got it wrong?
Many thanks
Andreas