definitely keep it cold in the fridge, mold does grow in coffee. we've kept it for a week in the fridge but not longer. does steadily lose its character over that time.
i was thinking about how much human effort has gone into making instructional videos on how to do things and how all that content exists almost solely in the hands of Alphabet Corp
ive done this a lot, but also spent so much time in my life dealing with corruption on floppies that i have to cringe a bit inside as well