SSDs that feature in our Macs now are more limited in capacity, and high-res video, photos, music and other essential files take up more storage than ever. .

Running out of space can really hamper your computing: if you want your Mac to run quickly you need to make sure you’ve got something like 10 percent of your storage free at all times otherwise your Mac can really slow down (read: How to speed up a Mac). At worst if you don’t delete some of the things taking up storage space on your Mac you may even find you can’t start it up one day because the startup disk is full! You may already be seeing warnings that your start-up disk is almost full – you shouldn’t ignore them.
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