[MacTUG] macOS: What is Purgeable Storage on Your Hard Drive? - The Mac Observer

[m3griffi]

"""
Purgeable Storage

There are a bunch of features introduced in macOS Sierra about 
reclaiming hard drive space. A lot stuff doesn’t need to stick around, 
like log files, app installers, or duplicate files.
...

Optimize Mac Storage

https://www.macobserver.com/tips/how-to/macos-purgeable-storage-hard-drive/
"""