[Data Persistance] Saving Points Data, Wont work?

Data Persistance is deprecated, use DataStores

With Data Persistance, there isn't a garuntee that your data will be saved. So i'm gonna walk you through how to use DataStores.

With data Stores, you're going to have to know 4 methods. GetDataStore - Method of DataStoreService, use it to define the datastore you're using. GetAsync --Use it to get the data from a key, will return saved data or nil. SetAsync --Use it to save data to a given key. Update Async --Use it to update data from a key, second argument is a function that has a parameter of the old data and returns the new data.

So, we want to set up our DataStore.. we use DataStoreService

local ds = game:GetService('DataStoreService'):GetDataStore("Points")

Next we make a PlayerAdded Event to load any data that could be there, if there is no data then set it to 0

game.Players.PlayerAdded:connect(function(plr)
    local key = tostring(plr.userId).."_points"
    local data = ds:GetAsync(key) --Get the potential data
    data = data or 0 --if data is nil, set to 0
    local l = Instance.new('IntValue',plr) --create leaderstats
        l.Name = 'leaderstats'
    local p = Instance.new('IntValue',l) --create points
        p.Name = "Points"
        p.Value = data --Set points to data
end)

Now we have to make sure that data was stored at some point.. so we use a **PlayerRemoving Event* to save data into a key.

game.Players.PlayerRemoving:connect(function(plr)
    local key = tostring(plr.userId).."_points" --key to save
    local stat = plr.leaderstats.Points --points stat

--If there is data already saved we want to use UpdateAsync, other wise we want to use SetAsync

    local data = ds:GetAsync(key)
    if data ~= nil then
        ds:UpdateAsync(key,function(old) return stat.Value end)
    else
        ds:SetAsync(key,stat.Value)
    end
end)

You can read more about DataStores here

You also might want to consider using game.OnClose to set a function that saves everyone's data. in case of instances where your gam may crash or with 1 player servers the server could close before the script saves your data.

So all together?

local ds = game:GetService('DataStoreService'):GetDataStore("Points")

game.Players.PlayerAdded:connect(function(plr)
    local key = tostring(plr.userId).."_points"
    local data = ds:GetAsync(key)
    data = data or 0 --if data is nil, set to 0
    local l = Instance.new('IntValue',plr)
        l.Name = 'leaderstats'
    local p = Instance.new('IntValue',l)
        p.Name = "Points"
        p.Value = data
end)

game.Players.PlayerRemoving:connect(function(plr)
    local key = tostring(plr.userId).."_points" --key to save
    local stat = plr.leaderstats.Points --points stat
    local data = ds:GetAsync(key)
    if data ~= nil then
        ds:UpdateAsync(key,function(old) return stat.Value end)
    else
        ds:SetAsync(key,stat.Value)
    end
end)