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.
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.