Assuming Windows, Robocopy has a multithread option that might be able to do multiple copies simultaneously. Haven’t used it. Not sure. Free. Worth looking into.

I bought a G3 from China, using a coupon code from a YouTube reviewer. 99%. Bare bones.

I added a 32GB DIMM (the machine only takes one DIMM), and a 512GB SSD. The machine came without an OS installed.

I first installed ESXi 8.0U2, added the host to vCenter, and moved a Windows 10 VM onto the NucBox. It ran pretty well.

I next created a Windows To Go boot USB with Windows 11 on it. That runs pretty well also.

It’s a cute machine and worth what it costs. It should run a good few lightweight applications, either as VMs or containers.