Follow these steps to reduce your storage demands.
For reasons of cost, we might buy a new Mac with a smaller drive than the one we’re replacing. If your current Mac has more data stored than the capacity of the new one, you probably feel you’re in a pickle. But you can strategize how to make this transition work.
When planning the transistion, I highly recommend that you try to keep free at least 50GB on a 256GB drive, and 100GB on drives that are 512GB and larger.
Here’s how you can reduce your storage requirements before migration.
Read more at MacWorld.com