You get access to a full desktop-grade AMD Ryzen processor and up to 4GB of DDR4/DDR5 RAM. This is more than enough to run basic plugins and lightweight modpacks.
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To keep your server online indefinitely, you only have to log in and fulfill a quick "monthly activity confirmation". If no one is playing for a long period, it may go to sleep, but it does not have the strict hourly queues of other platforms. You get access to a full desktop-grade AMD