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Lots of questions! I'll see how much I can clarify for you.
1) In general, yes, you can replace a RAID controller without losing data. However, it has to use the same firmware stack. SRCS16 and SRCSATAWB do *not* use the same firmware stack.
2) You cannot install the SRCSATAWB on an SE7210TP1. See http://www.intel.com/support/motherboards/server/se7210tp1-e/sb/CS-009920.htm - only RAID cards that came out around the same time as the board, are supported.
3) If you need to stick with that motherboard, check the THOL for other cards that do support bigger HDs, or go for an external SAN.