When you change the GSS Engine Debug Logging path and filename in Symantec Ghost Solution Suite Options > Debug tab:
And change the log file name to something other than axengine.log (common example GSS_Server.log or GSS_Debug.log) - it might prevent the second backup log file (default axengine_2.log) creation.
GSS 3.3.x (up to GSS 3.3.13)
When the first log file reaches Max File Size, it copies the default filename into %logfilename%_2.log, and if it's different from the default, then it fails and starts to overwrite the default %logfilename%.log from scratch, thus losing previous log file content.
under investigation by engineering
As a workaround, it's suggested to keep the default filename (axengine.log) to ensure that additional evidence would be created.