How do you keep a model from falling apart when you re spawn it?

Making a game where you have to blow stuff up and the parts are not anchored. So how do you make it so the model doesn't fall apart upon re spawn?

Cheers

local regenTime = 180 -- 3 minutes
local messageTime = 2

local model = script.Parent
local message = Instance.new("Message")

--Check that the script hasn't been placed in workspace
if model ~= workspace then 
    message.Text = "Regenerating Massive Noob This May Cause Lag"

    local backup = model:clone() -- Make the backup 

    while true do 
        wait(regenTime) 

        --Remove the model
        model:Destroy()

        --Show the message
        message.Parent = game.Workspace 
        wait(messageTime)
        message.Parent = nil

        --Copy the backup
        model = backup:clone() 
        model.Parent = game.Workspace 
        model:makeJoints()
    end
else
    error("Script not put in a model! Nothing to regenerate!")
end