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?
My TrueNAS setup uses a used Ryzen 3200G and mATX motherboard I got off of ebay for about $100 total. Honestly, any CPU with integrated graphics should be fine, so maybe something like the Intel 8500T, which was specifically a low power SKU could also work. Unless you plan on doing a lot of video transcoding, then you might need something more powerful (or a low end GPU like the Intel Arc A310 or a Radeon 6400 to go with it)
I’m not so sure how TrueNAS Scale determines how much RAM to allocate for ZFS, but at least with Proxmox, the wiki says you want to have at least 2GiB + (1 GiB/TiB of storage) of RAM to be able to be allocated.
If you’re looking to use 2TiB of storage, that would be at least 4GiB of RAM dedicated just to ZFS cache, so 8GiB of RAM would probably suit you. You might need to get more RAM in the future if you want to go with more storage at that time.
As for a case, anything will do as long as it can hold however many hard drives you ultimately wish to put in it.
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