Brad added a new capability to Engen 1.0.59. Under Engen's settings, you can now choose to back up your configuration to a file or restore from a file.
The backup files are stored on the local device, not on the server. That means you can easily recover your configuration, even if the server dies, or if you decide to switch to a new machine. The configuration is backed up to your phone or tablet.
I just tried it and it works. Thanks, Brad!