You could pipe the standard out to a file when you run it and check for errors. This would tell you if it is running into an obvious problem in the download process, otherwise if it completes without errors it was likely successful. If the Fixlet site download wasn’t completed correctly, you’ll get an error in the GatherDB log on the BES Server when it tries to import the data. GatherDB will check the digital signature and verify that the full site content was downloaded correctly. I don’t think that the makemirror.exe tool verifies the digital signature though.