I know this software is used by a few on here - just keep an eye on the folder it stores these, as there's no way to restrict the size of it other than manually cleaning or deleting them. It is perfectly OK to delete files saved for old projects, but it may take longer to find them again if you re-open the project. My main editing PC was mysteriously filling the C drive which is a modest size SSD. I discovered no less than 39GB being used as a cache by adobe. You can access info on it from edit > Preferences > Media.