In the MC206 and MC206X, the TABLE is in battery backed RAM.

In the MC4/5/6 Flash memory is used but like a USB Flash-stick.  The firmware creates a file store area on the Flash and maintains an index to the contents.  The Flash memory used is much bigger than the total amount of VRs (or TABLE when FLASH_DATA is set to 1) os pages of Flash are only erased when there is no more room for new values.  That way we calculate that if you change the data every few msecs, then even with that rapid change, the Flash will last more that 20 years.