External storage and RWW memory - SARA N211

Hello again to the whole community!
In my university project we want to use the Sodaq SARA N211 board to get raw datas from sound sensor through ADC.
Probably we need additional storage, because 32Kbytes SRAM seems not to be sufficient. Is it possibile to use an SD Card or another flash chip?
If so, will this SD Card shield from Seeedstudio be ok?

Another little question. Can you confirm me that the ATSAMD21J18A MCU that is on SARA N211 doesn’t have any internal RWW (READ-WHILE-WRITE) memory section? I found this information on its datasheet.

Thank you all.