• lightroom keeps secret duplicates of each photo so they take up way more room. I'd only keep copies in lightroom of ones you are actually going to edit. There's a program called OmniDiskSweeper which is free and good to showing you how big each file and folder actually is.

  • on that note there's also an app called daisy disk which shows you in visual form the amount of space files/folders are taking up on your hard drive, so you could can quickly find what's taking up the most space and delete.

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