Do not underestimate the software RAID. Software RAID would typically provide the same, of not better reliability than an entry-level server hardware RAID controller. Software RAID is easier to move around from server to server. It does not require an identical replacement controller in case of a controller failure, which is sometimes a hinderance with server hardware. In RAID 0, RAID 1, and RAID 10, the hardware RAID controller does not provide any computational power benefit because there is nothing to offload. Most modern SOHO and small business NAS devices, like Synology, QNAP, or NetGear, use the software RAID (Linux/mdadm).