'Option-click-ftw'

###TL;DR:

Rather than a plan click and drag, if you hold option, it will create a copy of the file rather than move the original.

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I didn’t know i needed it!

Use-cases:

• Copying a folder with a project or application to start a new one based on the old
• Creating a sharable album of photos without deconstructing the original
• Simple version control: option + drag and drop to create a quick copy anywhere

Don’t forget you can click and drag across Hot Corners, while using Gestures, or while fast-app-switching