Satisfactory server hosting: your factory drives the load
Satisfactory is one of those games where your server does not get heavier from more players, but from what those players build. A factory of thousands of machines with belts full of parts is simulated continuously, even when nobody is looking at it.
Your factory drives the load
Early on you notice nothing. But once you move towards the late game — multiple production lines, train networks, hundreds of constructors — your server starts doing real work. Four players with a sprawling megafactory ask more than eight who just started.
Which also means: if you plan a long-running save, pick something roomier from the outset. Upgrading midway is possible, but you feel the slowdown sooner than you expect.
Autosaves grow with you
Satisfactory saves automatically at intervals, and those files grow as your factory does. Keep some disk space free and clear out old saves periodically — or let automatic backups handle it.
Dedicated server
Satisfactory has an official dedicated server, so you do not depend on a host player. You manage it from inside the game: connect to the server address and configure everything there, including loading an existing save.
How much RAM
2 GB for a starting world, 4 GB for a serious factory, more once you head towards the endgame.