Your attempt at making a saving system is odd. Do you know what IntelliSense is in the script editor?
Anyways, if you want to make one, you can try by looping through the folder and getting the values. Here is something basic:
local Values = {}
for _, value in ipairs(RSFolder:GetChildren()) do
table.insert(Values, value.Value)
end
local SaveSuccess = xpcall(function()
YourDatastore:SetAsync([key], Values)
end, function(err)
warn(err)
end)