I just installed a server on my pc to try out some plugins, but every time I shutdown the server it rolls back a little bit on the next startup? so I'm wondering what is the right way of doing that so it saves to the very last second 

You can type server.save in console before shutdown.

The quit command in Rust automatically saves. If you are forcefully closing the sever via a host panel, that will potentially cause issues such as file corruption.

Thank u