The machine is intended primarily for Adobe Lightroom use. The picture collection is currently about 2.5+ TB. Mostly Nikon NEF file processing.
Two 2TB M.2 SSDs + 1 2TB SATA SSD are part of a Windows 10 Storage space in simple no resiliency mode. The Lightroom catalog is on a 1TB M.2 drive (boot drive). This combination seems to help performance a lot, at least compared to the previous setup we had.
So far, the machine is amazing. A major step forward on the i7-7700k that was used for this purpose before. About half the parts were from the old build.