Hi @Mr. Cheese,
Welcome to the Enpass community.
We do not recommend "Pausing the server" because auto-sync happens after every 15 secs, while the app is in the foreground. Also, when you save any change in item details or master password, Enpass waits for 5 secs and initiates an auto-sync.
So it is not advisory to pause the sync server although you can but no changes made will be reflected on your client device.