I am looking for a better backup solution for my security camera setup, but I am debating whether or not to get one of those Ugreen prebuilt NASs instead of building my own and building my first rack. I want to spend at least about 2k because I'd like something that lasts. This would need to be able to scale up to at least four more Rio link cameras as I currently have nine and can't fit another drive into the DVR itself, so I was looking to use an FTP backup.
My biggest concern would be cooling the server. The garage where I am and the security cameras are pretty poorly insulated, so I'm slightly concerned about venting the Heat. I have thought about venting it into the upstairs area between the roof but would rather not. In my mind, the main upsides to building my own would be much better Hardware as well, as it's roughly about the same price as what I'm looking to spend. I have looked at some used Dell servers that are pretty cheap as options. I've done some work in Linux primarily for fun, and I'm not worried about getting my hands dirty as far as installing operating systems and the like.