FWIW, for anybody considering dipping their toes into liquid cooling, it doesn't necessarily have to involve maintenance and extra effort depending on use case.
I have a Corsair H50 all in one liquid cooler (approx $50) and it's closed loop, totally maintenance free so far for a couple years. Runs cool and have a nice overclock going on my gaming PC with zero effort. Probably my favorite PC purchase of all time. Reviews of this unit say it is "only" as effective as a good air cooler. Considering the price is comparable to a good air cooler, I considered that a huge win... same price, same cooling, but I get to delete a noisy fan from my PC? No-brainer IMO.
One caveat is that these all-in-one closed loop solutions probably have a lifespan and I'm not sure how suitable they would be for a server running 24/7.
For me, my gaming PC is (unfortunately) only running a few hours per week so it was not a concern.
Even better, perhaps (depending on use case) 2TB USB-C SSDs from Samsung are regularly hitting $250 and under recently on Amazon. I have really been impressed with mine. I am getting close to 450MB/sec transfer speeds on my 2015 Macbook w/ USB3. I think that represents a saturation of USB3 and they might go a bit faster on USB-C, not sure.
https://www.amazon.com/deal/9531335c?showVariations=true