For a home NAS, I don't think you need that much. 8 drives is hardly "mini". I have a CM4-based NAS (with it's single PCIe lane) I built for home with 4 drives and it performs well enough for my needs.
However I use a a Turing Pi 2 with 3x CM4 and 1x Jetson Nano. The Nano can utilize both NVMe and SATA while the CM4s cannot utilize NCMe. I'm using a MiniPCI to SATA converter for SATA. You could use a MiniPCI to NVMe converter though.
I have not set it up yet (I already have a working NAS and offsite backup NAS) but for the data you can use smaller SATA drives together with say Ceph or Longhorn.
Although the price (minus decked out RAM versions) for CM4s has settled as availability has been fixed, and the RK1 for Turing Pi 2 is also out, I would still welcome competition for CM4 and ARM64 in general.