After building UE 5.8.2, it consumed a huge amount of my disk space. I followed suggestions from an AI to clean up some files, which resulted in unfixable engine launch errors. I ended up having to re‑download the source code and rebuild the engine. Now I’d like to ask everyone: how do you clean up redundant and unnecessary files after engine compilation? What exactly is safe to delete? Thanks for your help！
dont let an AI tell you to nuke Intermediate/Binaries from the engine build, those are needed at launch.
safe to trim after a source build: Engine/Binaries/DotNET leftovers, Engine/DerivedDataCache, Engine/Intermediate/Build if you dont plan to rebuild soon but keep Intermediate/ProjectFiles if you still compile from IDE. also clear your project DerivedDataCache, not the engine one, if you want space back.
unsafe: deleting Engine/Binaries/Win64 dlls, Engine/Plugins intermediates, or Engine/Source after build. if disk pressure is high just archive the whole engine folder to an external drive before deleting anything, rebuilding 5.8 from scratch takes hours.