When the application is processing a large file it can appear as if the software has stalled. Depending on the size of the file and your internet connection it could take up to a day to backup one file. If two large files are backed up in succession the progress could only show a couple of files over a 48 hour period. This is normal, please do not be alarmed.
The application shows two progress bars, the top one shows the overall progress of the backup, the bottom one shows file progress. The larger the backup is the longer the progress bars will take. Little or slow movement generally suggests a large file is being processed.
Please also note users backing up large amounts of data will have their file processing times lengthened rather than any bandwidth being restricted.