Connect your external drive to your PC and go inside the 'Steam' folder, and by default games will be inside 'steamapps' and then 'common'.
Now you're inside File Explorer, navigate to the location of the folder from the previous step.
Copy your Steam library to an external drive Note down the path to the folder and head over to File Explorer. In here you’ll already have a default folder set up if you didn’t manually set a different location. Click the ‘Steam library folders’ button and another box will pop up. Select ‘Settings’ and then in the box that pops up select ‘Downloads’ from the sidebar. Open up Steam on your PC and then click ‘Steam’ in the menu bar.
