The log file is located in the GUI STATUS -> Hardware -> Function: Logs then click on the Download button. Then use a program like WinRAR to open the ..tar.gz file then search in the main dir listings for the rsync.log other logs you should look at to make sure all is ok is the Tasks, dmesg2, critical errors there are a few others and how to understand them we have a video on our website as with many other videos that you can learn logs.