We don't "copy first", nor do we "copy all files first before deleting any". We act on encounter in a single pass (as I explain in the Troubleshooting section of the User's Guide).
And, yes, we have some ideas for how to improve this, but they're not yet in the product.
To be clear: most users do not run with disks that are 90% full.
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--Dave Nanian
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