Use-Cases: In operation not 24/7. Powered on just on-demand, after each use session powered down. Backing up user data, user photographs, Time Machine backups in sparse bundles, occasional file exchange, occasional DLNA-streaming, smartphone internal flash backups.

Durability, zero-noice and performance wanted.

Considering to have all-ssd NAS with 4x2TB ssd’s - no HDD. Overall physical build volume comparable with commercial 2-bay solutions, eventually bit more if each ssd will need own heatsink. 2.5GB local network, later on eventually 5GB.