In the meantime my FreeBSD & zfs based nas that I've set up on 2010 is still working. It is in pretty compact case (this one: https://www.pccasegear.com/products/18265/chenbro-es34169-mini-itx-server-chassis), using very low power CPU (Nvidia iON, remember that one?). Just changing case coolers once in a few years and replacing broken HDDs.
In the meantime my FreeBSD & zfs based nas that I've set up on 2010 is still working. It is in pretty compact case (this one: https://www.pccasegear.com/products/18265/chenbro-es34169-mini-itx-server-chassis), using very low power CPU (Nvidia iON, remember that one?). Just changing case coolers once in a few years and replacing broken HDDs.