This is a quick reminder post about storing your Sims 4 (and Sims 3) game and saves on an external drive because your Mac internal disk is full. There are two steps to doing this.
Step 1 – Installed game:
Change the game library location in Origin to the external drive and then either redownload the game onto the external drive and delete it from your Mac (preferable) or move the installed game and Sims 4 Packs folder from the internal drive to the external.
Step 2 – The user data Sims 4 folder:
The folder containing your saves, mods, library, game settings, and all other user generated data. This requires using the command line in Terminal. Full guide on how to do this can be found here.