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

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.

Files you no longer use can be archived to an external drive or the cloud, while downloads, duplicates and temporary files can be deleted altogether. Below, we explain how you can remove unnecessary ...

If you need to clear off space on your Mac for OS X Lion, more photos or just to have some breathing room; we’ve found a great way to free up disk space — delete old iPhone and iPad backup files.