Mel,

you are right,
but this would mean I have got to "Format" the EEPROM each time
after I have transfered the Loggers Data to some other system.
This means an additional write to every memory cell that was previously used.

By storing the "pointer" in the RTC's NVRAM I could double the lifetime of the EEPROM,
as I don't have to "clear" the memory, I just reset the pointer in NVRAM.

or am I missing something here ?