SFS2X provides detailed logging of all its activities. You can consult them at any time by checking the logs/folder. Additionally under the logs/boot/ folder you will find detailed logs of the boot phase.
Should the server have any issues starting the boot logs will help you pinpoint the problem quickly.
The logs are also inspectable via the AdminTool > Log Viewer. For more details see this section of the online documentation.
Finally you can learn how to customize the logging configuration here.