While we do support cloud saves (except on Epic Games), we still recommend that you manually back up your save files so that you can recover your progress in case of an OS reinstallation or save file corruption.
Steam (PC)
Your save files are located at:
C:\Users\%user%\Documents\Avalanche Studios\COTW\Saves\%SteamID%\
Just right click on this folder, select copy, and then paste it in the desired location.
You can also store your backup on a USB drive or an online drive (e.g., Google Drive, OneDrive, etc.).
To restore your progress, paste your backup folder back into the original save file location, overwriting the current one.
Epic Games (PC)
Your save files are located at:
C:\Users\%user%\Documents\Avalanche Studios\Epic Games Store\COTW\Saves\%EpicGamesID%\
Just right click on this folder, select copy, and then paste it in the desired location.
You can also store your backup on a USB drive or an online drive (e.g., Google Drive, OneDrive, etc.).
To restore your progress, paste your backup folder back into the original save file location, overwriting the current one.
PlayStation
Please check the following articles for:
Xbox
Xbox doesn't offer a way to manually back up your save data.