Question How can I tell what type of RAM I need for the six websites on my server?

[Colonel36]

Server operating system version

Ubuntu 20.04

Plesk version and microupdate number

Plesk Obsidian18.0.57

Hi.
I think the VPS server I have is maybe too much, I want to know wheter I could downgrade the RAM, but I don't want the server to fail.
Is there a way to check how much I need and wheter or not I can downgrade?
Many thanks

 

[Bitpalast]

When your websites are in full swing, what is the output of
# free
on your console?