Did you know the NTFS file system used by Windows 10 can transparently compress your files to save disk space? Windows included compression in the NTFS file system for years but the complex options that provide the real value were hidden in a command line utility known as compact.exe. If you are a command line ninja I suggest taking a look at compact.exe /? to learn about the options. For everyone else, there is a very useful graphical interface called Compact GUI.