Like this – “Your disk is almost full” (for macOS Sierra, or High Sierra). It happens to the best of us — which is why everyone should know how to declutter and free up disk space on their Mac. Time Machine always copies the whole file because it is not able to transfer only the differences. This may be a new drive that is not set up. OnyX Freeing space on your Mac OS X startup disk.
How to free up space on Mac and how to fix Startup disk full.
Most of the time this is not possible and the computer crashes or becomes very, . OS X goes to the added effort of showing you how big each folder is , not just each file. However, those files take up a lot of space on your Mac. Note: We recommend that you remove the insides of these folders, but not the folders themselves.
To remove unused language files can free up more disk space. To check how much free space is available on your startup disk. Archive — move, copy and delete, or backup and remove — files you do not use regularly to.
Luckily there are quick and easy ways to free up space on your hard drive.