I love the IBM x3650 range. My absolute favourite workhorse.

Desktop editions of Windows can be used for a simple home NAS. However, it doesn’t have a lot of advanced features supporting that use-case. Once you have a NAS, all of your digital data tends to end on it, which makes it a very critical system. Desktop Windows has one significant advantage, that you can run Backblaze personal computer unlimited backup on it to secure a backup of your critical and non-critical data in case of a disaster. On the down-side, there are no good RAID-features available for desktop Windows, making your data very vulnerable to drive failures, which are quite common. I personally prefer to run a homeNAS on something supporting the ZFS file system, such as Linux with OpenZFS or TrueNAS,but it is very important to choose a system based on your own skills, so you are able to set it up and manage it safely.