I'd agree. Get yourself a dedicated box and either a pair of drives for a mirror (I used to run 3 for good measure) or a decent hardware raid card and a bundle of smaller drives with RAID 6 or possibly 10 with a hot spare and a cold one on the shelf....

Avoid RAID 5, particularly with bigger drives (see MTBF on RAID 5 with large drives) Plenty of horror stories on the kernel raid list !!
Avoid external drives for data. Way too slow.
Personally I run all my SMEs as VMs on Proxmox these days. Hardware RAID for Prox, and VMs installed with NoRaid/NoLVM... think there is some stuff on the wiki about that.
Think I only have one real hardware SME as a affa backup box.
You can pick up decent secondhand servers pretty cheap usually. Just be careful with server drives advertised at low prices as 'bulk new'. They'll be secondhand in a new plastic package. A real ebay scam
