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This question already has an answer here:

macOS Sierra system is using over 200 GB of storage space on my 250 GB hard drive. I've removed Time Machine backups to no avail. How do I free up space? My current usable space being less than 50 GB is getting quite problematic.

Edit:

The culprit has been found. Imagemagick is creating tons of temp files for some reason.

enter image description here

marked as duplicate by Mark, IconDaemon, user3439894, Tetsujin, grg Oct 14 '16 at 19:05

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  • Adding to the commotion; Space freed up by removing personal files quickly gets eaten up by system – matthiasdv Oct 14 '16 at 13:11
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    Please add what you found as an answer and then you can accept it. This will help others who have a similar problem with this software. – fsb Oct 14 '16 at 13:21
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The Solution

I used a storage scanning application to see where all the space was going. I used DaisyDisk, but Disk Inventory X is another option

Turns out ImageMagick image editing library was rampantly creating large files at /private/var/tmp

enter image description here

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