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Just a side note, but I would almost always prefer a

Sync

task over a

Copy

task. Regarding the actual question, it should be something like

from(A) {
    into 'B'
}
into layout.buildDirectory.dir('X')

I tried 100 things, but not that 🙂 Thanks a lot. Also, I didn't know about Sync. Will use it from now on. Cheers!