Best method to save data without too many requests?

I tried saving data each time the value has changed, but it gave me a warning and told me to send fewer requests. What should I do about it?

Should I use an infinite loop to wait a certain amount of time and then save the data? Help, please.

while true do
	wait(180)
	saveData(player)
end

Note that the code above is just a hypothetical solution I imagined, and does not contain the actual code for the functions. Thanks.