Yes, I’ve been tinkering for a while. The network piece I have had the longest is actually my 10G switch. Previously I had a couple 8 port switches but when I started wiring the house up I didn’t want to be playing any games.
I buy a lot of used enterprise equipment. If you are planning to have multiple access points that can use POE (power over ethernet) you can buy a new 5 port switch and be ok but if you are thinking about cameras a used 24 or 48 port POE switch from ebay well save you a ton in the long run. The Dell PowerConnect 5548 (48 port 1Gbps switch) I am using provides two 10G connections so that I can use a pair of DAC (Direct Attached Copper) Cables for a total of 20Gbps from my 10Gbps backbone. It’s overkill but it means even with multiple cameras, ap’s and wired clients I don’t have to worry about oversaturating the connection. My camera server also connects via fiber as does my NAS/media server.
Mini pc’s are great right up to the point where you want to expand beyond what they are capable of. Without a PCI Express slot upgrading the network will require the use of a USB adapter but they can be more of a pain than it’s worth. You can find stuff with more ports but there is a point where it will probably be cheaper to just get something you can expand with.
For failover to 4G the Netgear LM1200 has the option to go between your current internet connection and your router and negotiate the connection and automatically switch. I just use it like an ONT (Optical Network Transceiver) or Cable Modem and let OpnSense control the switch over because then I get accurate measurement of the data used and length of downtime. But that also means I need a minimum of three ethernet connections two for WAN and one for LAN.
I purchased my router parts used on Ebay. A similar setup in a 1U format (which I wouldn’t recommend unless you have a place where you can keep it and not hear it in your day to day life, are deaf, or are wrong to swap it into a new case with a different cooler) can be picked up as of right now for 185.00 plus tax and about 35 shipping.
If you have questions though please feel free to ask.



If it’s a 1U they can sound like a jet engine. The Noctua 40MM fans can be swapped in and cut the noise a good bit.
You can also build a shroud to place over the case, the idea is to allow the air to flow but use something like deep pile carpet to line the inside and absorb the sound created.
It will never be silent but you can get the sound to the point where it won’t rot your brain.