Is there a way to get a list of propeties in a instance?

Is there a way to get a list of propeties in a instance because i wan't to make a module that can save - load instances using data store.

Idea:

local module = {}
local instanceStorage = game:GetService("DataStoreService"):GetDataStore(game.PlaceId .. "INSTANCE") --Pfft

function saveInstance(instance, name)
    local saveData = {}
    for i,v in pairs(--[[Properties of Instances]]) --Problem
        table.insert(saveData, v) --Insert value
    end
    instanceStorage:SetAsync(name, saveData) --Save!
end

function loadInstance(name)
    --no idea left
end
return module

This is the bad example, but OK...