It's often good to keep (one way or another) a copy of the stable release you had before any map or firmware update. That way, when you later discover that newer isn't better, you can drop back one version whenever needed. As an example, TomTom has been known to provide the occasional stinker of a firmware update, and when that happens, it's handy to have your last one available to you to reload, although with those, we can always get you a copy. Maps, on the other hand, are keyed to your unit. Always have current and current-1 of those somewhere that you can find them later.