For simple setups Caddy [1] is great. It supports HTTP/2 out of the box, and even provisions the certs for you from LE automagically. The defaults are much saner than nginx.
I edited one note and pressed "library" instead of the floppy, since there appeared some text, that said, it was autosaved .... But when I got to the library, the note was in the same condition as before the edit.
So, according this test, "auto save" does not work (correctly) IMHO.
I'm not the author, but I believe he's welcoming any help on taking this further. There's a neatly organized list of things to do in the Github issues.[1]
Also, according to the article there is only double redundancy. I thought critical systems like this always employed triple redundancy. It doesn't help too much if you detect a fault during launch and have to reboot both systems...
Also everyone on Unitymedia. Dual stack if you're a lucky older customer, DS lite (CPE has routable IPv6 and NATed IPv4) if you are new or get something changed.
I just noticed that a few weeks ago, with no change in contract. I have a resold Telekom VDSL line, and I was quite pleased to find that I now have a native IPv6 connection with a /56 assigned.
I'd tried some IPv6 settings in my router last year, and 6to4 worked pretty well at that point.
When have you been in Istanbul last? They've been expanding the public transport system a lot in the last few years (new subways, metros, a train running the marmara sea). I was there just a few weeks ago and had no problem getting around.
[1] https://caddyserver.com/