Moving an existing map across, turning the rates up so it is actually playable with a small group, and getting admin on your own server.
ARK keeps the world, the players and the tribes in separate files. Copy the world without the rest and everyone loses their characters, so take all of it.
...\ARK\ShooterGame\Saved\SavedArks.
TheIsland.ark, Ragnarok.ark and so on — plus every .arkprofile and .arktribe file. The profiles are the player characters and the tribes are the shared bases.
ShooterGame/Saved/SavedArks/ and upload the lot.
.ark file you uploaded. A mismatch here generates a fresh map and it looks like your save vanished.
Official rates assume a server full of people playing constantly. For a few friends they are punishing, and this is the first thing most groups change.
ShooterGame/Saved/Config/LinuxServer/GameUserSettings.ini.
[ServerSettings], the three worth changing first are XPMultiplier, HarvestAmountMultiplier and TamingSpeedMultiplier. Somewhere between 3 and 5 suits most small groups.
ServerPassword makes it private. ServerAdminPassword is the one you need for admin commands — set it and do not share it.
Game.ini in the same folder, not this file.
Admin is granted in-game using the password you set above, not from the panel.
ServerAdminPassword is set and the server has been restarted since.
enablecheats YourAdminPassword and press enter. You should see a confirmation.
You can give friends access to the ARK server without ever sharing your account password. Sub-users get their own login and only the permissions you tick.
There are no server-side backups here. Every server has a backup allowance of zero — storing hundreds of gigabytes for a service nobody pays for is not something we can justify, so the Backups tab will not help you. The only copy of your world that exists is the one you download. Do this before any big change.