I am cluster hosting with a friend. Essentially we want to swap ownership of maps. He doesnt want to pay to change his map to Genesis 2 because of ram requirements you guys charge. Our main map is the one I currently own{Fjordur). We want to keep that map going and not lose anything on it. Is there a way to transfer ownership of Fjordur to him, and his current map to me so that I can take responsibility of Genesis 2.

So the "easiest" way to do this that I can think of with the least amount of cost and hassle. Server 1 is your server, server 2 is your friends server in the below example, and the reason why we're doing it this way is there currently isn't a way to restore your settings from a backup, as those are separate from backup files.

Step 1) Get a third server for temporary "settings storage".
Step 2) Make backups of server 1 and server 2, download both backups.
Step 3) Copy the settings from server 2 to server 3 (the temporary server).
Step 4) Copy the settings from server 1 to server 2.
Step 5) Copy the settings from server 3 to server 1.
Step 6) You should be able to safely delete server 3 at this time, with server 2 and 1 having swapped settings. BUT, as ARK is ARK, you may want to wait till finished.
Step 7) Restore server 2's backup on server 1.
Step 8) Restore server1's backup on server 2.

The other way to do this is with a THIRD account, as you can transfer account ownership simply by changing the email address on the account, but that also transfers all account info (Such as CC information and the like) and I'm not certain you would want that kind of information being accessible, however briefly.