> I don’t know why fastfetch always report more memory being used than the actual values. I’ve never seen more than 3GiB used in btop for this server

My guess would be that fastfetch probably reports actual memory usage while btop probably reports the total usage of all processes. The former is probably higher because of things like filesystem caching

I love people that aren't afraid to experiment and learn. As someone that hasn't had a formal education in software engineering (just in other kind of engineering) I learned the most by doing and failing.

Slightly off topic: What's currently the free Linux distribution with the longest support cycle?

For a while I used CentOS 7 on all of those small VMs, because it got security updates for a really long time. With minimal risk of breaking things on updates.