Non volatile memory integration

hi guys

i need general guidances next step in current projet - saving data.

my project works on way similar scubadiving computer do: saving data sensors during short session between start , end trigger - each second during approximately 3mn-, , make these data available being analized in connected computer. data erased , memory free next session. far, worked on sensors connection , data computation triggers.

the project using arduino nano because had keep miniature - sd card reader not option me. having considerd existing discussions subject, seems interesting use fram (i still don't know how amount of data need, not of first concern).

does using fram makes sense such project?
if so, there tutorial start with?
should mount ship myself, or buy shield?

thanks tips!

can explain objection microsd?
it seems me microsd smaller, simpler , have higher capacity other solution.

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