> You can get MiniPCs with 4-6 internal M.2 slots that are great for building a NAS with. Where can I find that? My current Intel NUC has two M.2 slots and a SATA connection. If I were to relax the definition of a MiniPC to include mini ITX then yes I can find these, but given how the author talks about being all-in-one, I doubt the author is talking about mini ITX builds.
https://www.bee-link.com/products/beelink-me-mini-n150 Currently in Pre-order, but $210 for 6 slots and an N150
One thing to note in this recent trend is that these designs mostly use the Alder Lake-N / "Twin Lake" cores, which are quad low-power E-cores (still adequate). But more critically, there's only 9 lanes PCIe 3.0! And some of those lanes need to go to networking, be it ethernet and/or wifi! Often there'll be 1x PCIe lane per SSD. Given that it's a NAS running maybe dual 2.5Gbit, this isn't catastrophically bad (1x can do 8Gb/s), but conceptually I find it a bit dismaying anyhow. https://www.techpowerup.com/cpu-specs/processor-n150.c4109