They call it the replay buffer, it works well. I use it sometimes when gaming so I can capture a cool clip to share with friends.
Seconding Memos!
There’s no official phone app, but I’ve been using Moe Memos and liking it. They have a list of 3rd party apps here: https://www.usememos.com/docs/contribution/community
I have my own domain and pay for Zoho to host my email. It works well aside from the occasional site that refuses to accept my email as valid because it’s not a .com/org domain.
I had a rebranded clevo back in 2009. It worked great for a few years before the dedicated gpu died. It was a sleek design (especially for the time) too.
DisplayPort out to HDMI in is generally easy to adapt with a cheap passive adapter, but going the other way is a huge pain.