If you use a Windows operating system, you probably know that your files are safely preserved as a backup file on your computer. Sometimes though, they use too much storage space or maybe you don't ...

In order to back them up, Time Machine has to copy the disk image file. If you make any change to the contents of a disk image, the entire file winds up copied to Time Machine.

If you've ever used a large file discovery tool like Daisy Disk, you may have stumbled upon a peculiarly large filed dubbed sleepimage.