Checkpoint64 has a preset for Total War: WARHAMMER: it already knows where the save folder is, backs it up automatically and keeps earlier versions. Everything this site has on Total War: WARHAMMER:
Total War: WARHAMMER
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Save file location
Windows:
%APPDATA%\The Creative Assembly\Warhammer\Save_Games
Linux:~/.local/share/feral-interactive/Total War Warhammer/VFS/User/AppData/Roaming/The Creative Assembly/Warhammer/save_games -
Sharing with friends
How to share your Total War: WARHAMMER world with friends, from playing live to taking turns when the host is offline.