I want to create a NAS for my family at home. I am already pretty sure about using TrueNAS as software, but the hardware is still open.
What hardware do you recommend for 2TB of usable Storage (+a second drive for mirroring the first one) that is used by 3 people for pictures, videos, and documents?
I believe the RAM calculation is less important for ZFS these days. I capped mine at 16GB for 64TiB useable pool and had no issues. (This was zfs on linux which i think Truenas Scale is based off anyway).
Regardless unless the same data is often being accessed the caching aspect may not be that important.
General consensus ive been seeing recently agrees with you that you really can get it running on surprisingly low end hardware these days, and finding less than 8gb of RAM in the ddr4 or 5 era is perhaps difficult enough that my above point is moot