I don't know if this is important to you, but beginning with Mojave you can no longer d/l versions of macOS earlier than the one you're running from the App Store, so if you want to maintain an archive, now is the time to do your d/l'ing.

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire