Often located in C:\Users\Public\Documents\Steam\CODEX\1551360 .
Copy these files and paste them into a separate, secure folder on your desktop or cloud drive. Transferring Saves and "100% Completion" forza horizon 5 1.405 save game
Depending on your platform or version, your save data is stored in different directories on your PC: forza horizon 5 1.405 save game