I am taking a guess here based on previous experience with older versions:
Your target server would need to be running the same version as the source for the DRS backup files. You would also need to make sure the target server has the same hostname and/or IP address. Even then, you would need to reprovision all license files with the new MAC address by contacting licensing@cisco.com. You will need to provide the new MAC address, and a sales order number to provide entitlement. After you do this, then you could reconfigure the IP address and hostname. Now, if you have subscribers, that could get pretty hairy.
To be honest, if you have 7.x I would consider using the bulk export/import utility. I, personally, see it as the path of least resistance based on the scenario you describe.
HTH.
Regards,
Bill
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