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Great tool for documenting your setup. I use this at work a lot

I was thinking about fuels like HVO. They work well, but have their own ecological implications.

Renewable fuels exist and are used today, but the efficiency and pollution aspects still apply.

I would say that "on prem" defines a location, "selfhosting" an action. You can do both at the same time, e.g. selfhosting nextcloud onprem.

Apparently, it is not only my oberservation, but the article says similarly:

The inconsistent approach to backward compatibility in decades past may also have played a part.

However, I'm not a db admin and my perspective might be biased (infosec).

I would say that this is a sign of a bad product. Apparently, compatibility between SQL server versions is not great.

Probably overkill, but for projects like this I've setup WordPress in the past. Once everything was done, I converted the WordPress page to a static site with httrack and use the static version.

This gives the ease of setting up and editing combined with the stability and security of a static HTML website.

While you can probably use them for some small tasks (like a switch, a file server with a USB thumb drive or a print server), you're probably better off if you can sell them and buy a raspberry pi or similar.

The Fritzbox 7530 for example could be sold for 50€ (at least in my country).

I heard some years ago that google trends can be used to track illnesses like flu.

That's exactly what the nextcloud desktop app does.

What I don't get is why anyone would like to buy a new gadget for some AI features. Just develop a nice app and let people run it on their phones.

TBH, the description in the original post is not very clear.