Re: How to make all the Sims 4 /expansions a backups ?

@valearci33  There are two Sims 4 folders you'll want to back up.  The user folder, the one that contains saves and other user data, is in Documents > Electronic Arts.  The folder with the game's program files is wherever you installed it.  The default location is this:

C:\Program Files\EA Games\The Sims 4

or this in a Steam install:

C:\Program Files (x86)\Steam\steamapps\common\The Sims 4

But if you use the EA App, you might have installed it elsewhere.  You can see the location by opening the App's game library and selecting Sims 4 > Manage > View properties:

Having said that, there's not much point in backing up the game's program files.  You'd still need to do a proper reinstall in order to actually run Sims 4; you couldn't simply launch the game from the program files without the involvement of the EA App.