Copy your data folder to another hard disk or location.
To find out where and what your folder name is, if you didn't call it something else and place it elsewhere, go to the launcher.
Click on Install tab, and note the Build xxxxxx folder name. (Write it down, or remember if you can what it is)
Close the Launcher.
Open up Windows File Explorer
Browse to wherever that folder is.
Copy the folder
Paste elsewhere.