While I get your point about size, I'd not use RAID-5 for my personal homelab. I'd also say that 6x2TB drives are not the optimal solution for low power consumption. You're also missing out server quality BIOS, Design/Stability/x64 and remote management. However, not bad.
While my Server is quite big compared to a "mini" device, it's silent. No CPU Fan only 120mm case fans spinning around 500rpm, maybe 900rpm on load - hardly noticable. I've also a completely passive backup solution with a Streacom FC5, but I don't really trust it for the chipsets, so I also installed a low rpm 120mm fan.
How did you fit 6 drives in a "mini" case? Using Asus Flashstor or beelink?
> I'd not use RAID-5 for my personal homelab.
What would you use instead?
ZFS is better than raw RAID, but 1 parity per 5 data disks is a pretty good match for the reliability you can expect out of any one machine.
Much more important than better parity is having backups. Maybe more important than having any parity, though if you have no parity please use JBOD and not RAID-0.
I agreed with this generally until learning the long way why RAID 5 minimum is the only way to have some peace of mind and always a nas with at least 1-2 extra bays than you need.
Storage is easier as an appliance that just runs.
I'm interested in learning more about your setup. What sort of system did you put together for $350? Is it a normal ATX case? I really like the idea of running proxmox but I don't know how to get something cheap!